Is it true that the circumference of a five pointed star surrounded by a one centimeter long wooden

With a 1 cm long wooden stick, the circumference of the five-pointed star enclosed is 5 centimeters. (x)

Because"Pentagram"The circumference is not 5 sides, generally"Pentagram"A minimum of 10 edges is required to enclose it. For a hand-drawn pentagram it is five sides, but it does not belong to the perimeter and has duplicate edges. So the answer is: false.

No, the pentagram is five angles, one center point, and the distance from the vertex of each corner to the center point is the same, and the five corners are to the middle line segment, dividing the center angle into an average of five 72 degree angles.

With a one-centimeter stick, every two of them form an angle and the top angle coincides with the five corners.

According to the rules, they are connected sequentially to form a five-pointed star, so a total of ten small sticks are needed.

The ten sticks are ten centimeters long, and ten centimeters is the circumference of the five-pointed star.

So the circumference of a five-pointed star surrounded by a one-centimeter-long wooden stick is five centimeters, which is not true.

Circumference centimeter Hello, it is not easy to answer the question if it helps, thank you.

Draw a triangle first, then a rectangle along the bottom edge (a square is fine), then draw this distorted diagonal, and the pentagram is drawn. When drawing, measure the centimeter diameter with a ruler.

Wrong. It takes 10 wooden sticks to enclose a five-pointed star with a one-centimeter-long stick, so the circumference is ten centimeters.

Summary. Hello, 1. First of all, make a wire with a length of m centimeters into a five-pointed star, and the side length of the regular pentagon formed in the figure is n centimeters. (The thickness of the wire is negligible) choose what is the circumference of this five-pointed star pattern?

Option am, bm-n, cm-5n, d5m-5n, choose c is right.

2. Then the reason is that it takes m centimeters to make a pentagram, and a pentagram has a total of 15 sides, and one side of the pentagonal shape is n, so the circumference of the pentagram is m-5n;

Make a five-pointed star from a wire that is m cm long.

I am Mr. Xiao Su, graduated from Beijing Normal University, and have many years of teaching experience in Shenrang I have seen your question, and it will take a certain amount of time to summarize the perfect answer for you, please be patient for a while.

Hello, you can send the original question to the teacher, and the teacher will answer it for you.

Okay, make a m cm long iron wire exactly into a five-pointed star, and the side length of the positive five scum formed in the picture is n cm. (The thickness of the wire is negligible) choose what is the circumference of this five-pointed star pattern? Option am, bm - n, cm - 5n, d5m - 5n, if I choose c, right?

Then write down the reasons for choosing it.

Okay, wait a minute, teacher

Also**, you send ** to the teacher [Bixin].

** is a five-pointed star.

Okay, wait a minute.

Hello, 1. First of all, a wire with a length of m cm is exactly made into a five-pointed star, and the side length of the regular pentagon formed in the figure is n cm. (The thickness of the wire is negligible) choose what is the circumference of the five-pointed star figure of this shed bridge? Chain Bimeng option am, BM-N, CM-5N, D5M-5N, choose C is right.

2. Then the reason is that it takes m centimeters to make a pentagram, and a pentagram has a total of 15 sides, and one side of the pentagonal shape is n, so the circumference of the pentagram is m-5n;

This is the concept of our perimeter.

The above is from Mr. Xiaosu, I really hope to help you

Ask about custom messages].

The length of the small rods is three, four centimeters, five centimeters, and six centimeters, and each of the three small sticks can be enclosed into a triangle, because the sum of any two sides of the triangle is greater than the third side.

1.A triangle is a closed figure enclosed by three line segments connected end to end.

2.In a triangle, the sum of any two sides is greater than the third side. The difference between the two sides is less than the third side.

3.If you take a small stick with a length of 3cm, 4cm, 5cm, because 3+4 5, 4+5 3, 3+5 4, and 5-4 3, 5-3 4, 4-3 5, therefore, the length of 3cm, 4cm, 5cm can be enclosed in a triangle.

4.The same is true if you take a small stick with an edge length of 4cm, 5cm, or 6cm. Because 4+5 6,4+6 5,5+6 4, and 5-4 1,6-4 5,6-5 4, the small stick that becomes 4cm, 5cm, 6cm can maintain a triangle, too.

5.In the same way, a small stick of 3cm, 5cm, or 6cm can also maintain a triangle. Because 3+5 6,5+6 3,3+6 5, and 6-5 1,5-3 6,6-3 5,the stick that becomes 3cm, 5cm, and 6cm can maintain a triangle as well.

Therefore, small sticks with a length of 3cm, 4cm, 5cm, and 6cm can be held in a triangle by holding one each.

With three five-centimeter-long trouser sticks to form a triangle, this Jusen Sanzheng Mu angle is a regular triangle, each corner is 60. So the maximum angle is 60 degrees.

If you want to change the patience of God, you must have to pay attention to each small stick, that is, to form a three-acre withered horn shape, each corner is 60 degrees. If it doesn't have to be end-to-end, it can be a different angle.

A triangle must have three sides, and if your sides are fixed and equal in length, they must be equilateral triangles, which are 60 degrees thia.

The long wooden stick is 45 cm long, and the short wooden stick is 35 cm long.

If you do not consider the overlapping parts of the side bureaus, the length of the wooden stick is calculated: 45 + 35 = 75 cm.

Because 1 meter = 100 centimeters.

So 75 centimeters = meters.

Therefore, the calendar is connected to the wooden stick and the long meter.

Significance of additive calculations:

In addition calculation, two numbers with the same sign are added, the same symbol as the addition is taken, and the absolute value is added. Add the two numbers with different signs, take the sign of the addition with the largest absolute value, and subtract the smaller absolute value with the larger absolute value, and add 0 to any number to still get the original number.

The essence of addition is that things are exactly the same, that is, the repetition or accumulation of bad talk about similar things, and it is the beginning of number operation, different classes, such as an apple + an orange, the result can only be equal to two fruits, there is a relationship between classification and classification.

Two, a total of only eight sticks, two is six.

Hope it helps, hope, thank you

According to the nature of the triangle, the sum of the two sides is greater than the third side, and the difference between any two sides is less than the third side. Therefore, we can use this property to judge which lengths of small sticks can be enclosed in a triangle.

According to the data given in the question, there are two small sticks with a length of centimeters, for a total of 6 small sticks. Assuming that the lengths of the three small rods selected are a, b, and c respectively (where a b c), there are several cases:

1.The three small sticks selected are all 3 cm in length, and they can be enclosed in an equilateral triangle with a side length of 3 cm, and there is only one case.

2.If exactly one of the three sticks selected is 3 cm in length, you will need to select the other two from the remaining five. Depending on the nature of the triangle, the remaining two small sticks must satisfy A + B > C, so there is the following combination:

Choose one stick from each with a length of cm: there are 3 combinations.

Choose one stick for each of the centimeters in length: there are 2 combinations.

There are 5 cases in total.

3.If exactly two of the three sticks are 3 cm in length, you can choose another one from the remaining four sticks, and there is only one case.

4.If there is no 3 cm in length among the three small sticks selected, you need to choose from 5 and 6 cm in length. Depending on the nature of the triangle, the remaining two small sticks must satisfy A + B > C, so there is the following combination:

Small sticks with a length of cm: there are 3 combinations.

Small sticks with a length of cm: there are 1 combinations.

There are 4 cases in total.

To sum up, the number of different triangles that can be enclosed is 1 + 5 + 1 + 4 = 11 kinds.

Five different key mountains are hidden in the triangle manuscript.

Use 16 small sticks 5 cm long to form a rectangle, and when it is put together into a square, the area is the largest, and the maximum area is (5 4) (5 4) 400 square centimeters.

Circumference: 16 5 = 80 (cm).

80 4 = 20 (cm).

20 20 = 400 (square centimeters).

The maximum area is 400 square centimeters.

Its maximum area is 15, 25, 2, 37 square centimeters, and then the largest is a square.

Summary. Hello! There are several ways to spell it in a row:

The length is 5x12=60cm, and the width is 5cm. Circumference (60+5) 2=130cm Swing in two rows: length is 6x5=30cm, width is 5x2=10cm.

Circumference (30+10) 2=80cm Swing in three rows: length is 5x4=20cm, width is 5x3=15cm. Circumference (20+15)x2=70cm

What is the maximum area of a rectangle made with 16 small sticks 5 cm long?

With 12 sides for a length of 5 cm.

Hello! There are the following spellings to put a row: the length is 5x12 = 60cm, and the width of He Wei is 5cm.

Zen Shengpei circumference laughing (60+5) 2=130cm Swing in two rows: length is 6x5=30cm, width is 5x2=10cm. Circumference (30+10) 2=80cm Swing in three rows:

The length is 5x4=20cm, and the width is 5x3=15cm. Circumference (20+15)x2=70cm

Kiss! Question 3: You're not right! It should be calculated in this troubled world to put a row of halls:

The length is 16x5 = 80cm, and the width is 5cm. Circumference (80+5)x2=170cm Swing in two rows: length 8x5=40cm, width 5x2=10cm.

The length of the limbs (40 + 10) x2 = 100cm Swing in four rows: length 5x4 = 20cm, width 5x4 = 20cm. Circumference 20x4 = 80cm

Question 4 is the same as in question 1.