The length of the minute hand is 30cm, how many centimeters does the tip of the minute hand go after

The minute hand goes around once an hour.

30*2*cm).

In fact, it is to find the circumference of the circle.

Solution: The diameter of the circle:

30 2 = 60 (cm).

Circumference of the circle: 60 cm).

Answer: Slightly.

The tip of the minute hand travels for a week, i.e. its circumference is 60*

Centimeter. After an hour of walking, the minute hand is gone.

Walking for one hour, the minute hand turns around, and the distance traveled by the tip of the minute hand is.

30*2*cm).

Summary. The radius is 40 cm and the circumference is:

Centimeter. In one hour, the minute hand is 40 centimeters long, how many centimeters does the tip of the minute hand move in 1 hour?

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1 hour, the minute hand goes for a week, the problem is to find the circumference.

The radius is 40 centimeters, and the circumference is: centimeters.

Look down, dear. A week walked centimeters.

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cm) Answer: 1 hour is absolutely the tip of the needle to move around and roll the rice

Analysis: Take the minute hand once an hour and calculate the circumference of the circle of the bucket, and the radius is the length of the minute hand

cm) A: 1 hour the tip of the minute hand moves up the centimeter

Comments: This problem first transforms the practical problem into a mathematical question, and directly solves the bridge according to the formula of the circumference of the circle.

Analysis: After an hour, the path traveled by the tip of the minute is a circle, and the radius of this circle is 10 centimeters, so this problem actually requires the circumference of a circle with a radius of 10 centimeters.

c=2 r=2 cm).

A: After an hour, the distance traveled by the tip of the minute hand is centimeters.

Because after 1 hour, the minute hand is rotated, so the radius is known to be 10 cm, so the distance traveled is 2 r = 2 cm.

After an hour, the minute hand rotates once and is 360 degrees.

Centimeter. Answer: After an hour, the distance traveled by the person at the tip of the minute hand is centimeters.

The minute hand travels once every hour, 24 times a day and night.

The tip of the minute hand is the circumference of the circle that forms the imitation of the song, and the circumference is the distance he travels in a circle.

Therefore, the distance to walk in a day and night is Zihan: 24-20 cm 2

Hello! Glad for your question!

According to the inscription: 20 2 2 80 (cm) cm) m) Answer: The tip of the minute hand is 20 cm long, and you can walk meters (about the same as meters) in a day and night.

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The minute hand of a wall clock is 20 centimeters long, and after 30 minutes, the distance traveled by the tip of the minute hand is centimeters, and after 45 minutes, the distance traveled by the tip of the minute hand is centimeters.

The process is as follows:

1) The minute hand of a wall clock is 20 cm long and goes around, the tip can be seen as a circle, find 30 minutes and 45 minutes, and the length of the tip is to find the corresponding arc length.

2) The distance of a circle: 20 2 = cm.

3) 30 minutes: cm.

4) 45 min: cm.

Solution: It takes 60 minutes for the minute hand of the wall clock to walk in one circle, and the arc traveled is 360 degrees, so the average radian per minute is 360 60 = 6 degrees, and the average radian per second is 6 60 = degrees (this question is not needed, extended calculation).

Therefore, the arc traveled in 30 minutes is 30x6=180 degrees (i.e., half a circle), and the arc length is: (180 360)x2 x20=20 (cm).

The arc traveled in 30 minutes is 45x6=270 degrees, and the arc length is: (270 360)x2 x20=30 (cm).

The formula for the arc length is: l = (n 360)2 r or l = n r 180

After 30 minutes, the distance traveled by the tip of this minute hand is centimeters; After 45 minutes, the distance traveled by the tip of this minute hand is centimeters

30 60 = 1 2, 45 60 = 3 4, , , = , cm); Centimeter.

Square Area - The area of a circle.

Solution: Because the minute hand rotates 6 degrees per minute, it rotates in 30 minutes: 6x30 = 180 degrees, and the distance traveled by the tip of the minute hand is:

2x20π/2=；45 minutes of rotation: 6x45=270 degrees, the distance traveled by the tip of the minute hand is: 2x20 x3 4=.

Think of it like this.

The bell is a circle. The center of the minute hand is the center of the circle. The length of the minute hand is radius r=20cm.

After 30 minutes, the minute hand is equal to half a circle, that is, find half a circumference 1 2 c = 1 2 2 r = 20 (cm) after 45 minutes, that is, 3 4 circles.

3/4 c = 3/4 × 2 π r = 30π （cm）

30 minutes is a semicircle, needle tip walking.

20 pie cm.

45 minutes is 3 to 4 rounds, needle tip walking.

2x20 pie x3 4 = 30 pie cm

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According to the title, this is to find the circumference of a circle with a radius of 30 cm and the circumference of a semicircle, so after walking for an hour, the tip of the minute hand is gone.

Centimeter. After walking for half an hour, the tip of the minute hand is gone. Centimeter.

One hour = 2 cm.

30 minutes = 2 1 2 = cm.