What is area in 6th grade What unit is used for area? Urgent!! Give points!

The surface of an object - the size of a flat figure, called their area in square meters.

The size of the surface of an object is called the volume of the object, and the most commonly used units of volume are square meters, square decimeters, and square centimeters.

Area is a measure of how much of the surface of a plane.

The area of all surfaces of a three-dimensional object is called the surface area.

The area of the bottommost surface of a three-dimensional object is called the base area.

Generally, it is expressed in square meters, which is m2 (where 2 is the superscript) The unit of measurement of the area mainly includes:

square meters – international standard units.

Acre – 100 square meters.

hectares – 10,000 square meters.

square kilometers – 1,000,000 square meters.

Municipal system: square city - square kilometers.

Square feet - 1 9 square meters.

Taiwan system: Taiwan A-9, square meters.

Ping - square meters.

Hong Kong: square feet (square feet).

The surface of an object -- the size of a flat figure, called their area is in square or something.

Such as square centimeters, square decimeters, square meters and so on.

The unit of area is square centimeter, square decimeter, square meter, square meter.

The surface area of the object.

square centimeter c

square decimeter d

square meters of acres a100 square meters.

hectares ha10,000 square meters.

km² k

The current primary school textbook defines it as follows: the size of the surface-plane figure of an object is called their area (representing the size of the two-dimensional plane figure).

The unit of area is generally square meters, square centimeters,

1 km = 1m = 1 = 10 dm = 00 cm = 1000 dm = 10000 mm.

1 square kilometer = 1,000,000 square meters.

1 square meter lifting = 10,000 square centimeters of stool.

1 square centimeter = 100 square millimeters.

1 cm 10,000 square meters.

1 square kilometer 100 hectares.

For 3 questions, you can add the area of the half garden and the parallelogram, and for 4 questions, calculate the area of the large semicircle and the small circle, and subtract the small half circle from the large semicircle.

Question 3: The semicircle pie on the top of the parallelogram area 4x8 x4x4x1 2

Question 4: If the radius of a major circle is 6 and the radius of a minor circle is 3, then subtract it to shade area = pie x6x6x1 2 - pie x3x3

The first shape can be translated from the triangle to the right gap to form a semicircle and a rectangle, and the calculation is sufficient. The diameter of the hollow circle in the second figure is the radius of the large semicircle, and the area of the large semicircle can be calculated by subtracting the area of the hollow circle.

Half circle plus parallelogram Half circle minus circle.

Hello, the number on the topic is not clear, I will give you the idea that you can solve it yourself1, the shadow area is a semicircle minus the area of the triangle, 2, this topic is the first expansion, is a circle has an area minus a square (also a prismatic The radius of the circle is known, and the area of the square is the square of the diameter divided by 2 (the area of the prism is the product of the diagonal divided by 2).

3. It is a semicircle plus a parallelogram, the area of the semicircle is multiplied by the square of the radius divided by 2, and the area of the parallelogram is the base multiplied by the height.

4. It is the area of a semicircle minus the area of a small circle The diameter of a small circle is just the radius of the semicircle, and there is data that you can calculate.

Calculate 1 for you

Happy to you! Such as satisfied!

Solution: The shaded part has an area of 36 square centimeters and a circumference of centimeters.

cm²)。The circumference of the shaded part consists of two straight edges with a length of 6 cm and two arcs, then c yin 6 2 + 2 2 6) 12 + 6 . Your answer is correct.

The area of this shadow can refer to the calculation formula of the parallelogram, and the two folded colors are put together to form a square, so the area of the shadow part is also a square, s=6*6=36 (cm).

The circumference is also easy to calculate, the two straight sides are 6cm, and the two curves are a quarter circle, which adds up to 6*