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Anonymous users2024-02-16cm).
cm) 1, circle area: s= r, s= (d 2). d is the diameter, r is the radius).
2. The area of the semicircle: s semicircle = ( r 2) 2. (r is the radius).
3. The area of the circle: S large circle - S small circle = (r 2-r 2) (r is the radius of the large circle, r is the radius of the small circle).
4. The circumference of the circle: c=2 r or c=d. d is the diameter, r is the radius).
5. The circumference of the semicircle: d+(d) 2 or d+ r. d is the diameter, r is the radius).
6. The area of the circle where the fan is located is divided by 360 and multiplied by the angle n of the central angle of the fan, as follows:
s=n/360×πr²
s= r l 2 r = lr 2 (l is the arc length, r is the fan radius).
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Anonymous users2024-02-15The length of the minute hand in Xiaoli's house is 5cm, and the length of the hour hand is 4 5 of the length of the minute hand. cm).
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Anonymous users2024-02-141) From 8 a.m. to 11 a.m., how many centimeters did the minute needle tip travel? The minute hand is empty, and the base is 3 12 = 1 4 weeks The tip of the minute hand has walked through the bucket: 1 4 * 6 * 2 = cm (2) From 9 a.m. to 12 a.m., how many centimeters has the tip of the space-time needle walked?
Hour hand 3 12 = 1 4 weeks Hour hand needle tip: 1 4....
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Anonymous users2024-02-13acres of sailing.
A: From 8 a.m. to 11 a.m. hail, the tip of the minute hand went to make spring centimeters.
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Anonymous users2024-02-12From 2 points to 20 minutes to 4:50 points, the tip of this minute hand with the tip of the Jan went around Pei Bi Chong.
cm) A: The tip of this minute hand goes centimeters.
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Anonymous users2024-02-11From one o'clock to five o'clock, the hand has gone 120 degrees, and it is 1/3 of a circle.
The hour hand is 4 centimeters long.
So according to the formula for the area of a circle: s r square is 1/3 times 4 times 16 times the square
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Anonymous users2024-02-10The distance that the tip of the minute hand has traveled is.
cm).The distance that the tip of the hour hand has traveled is. cm).
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Anonymous users2024-02-09The minute hand has been gone for an hour, and it can be imagined as a circle. To find how many centimeters the top has traveled is actually to find the circumference of the circle, and the length of the minute hand is the radius.
Length: cm.
The same is true for the hour hand, which travels 1 12 circles, and the hour hand travels 1 12 in circumference.
Length: cm.
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Anonymous users2024-02-08From 8:45 to 9:45, the minute hand went 1 lap.
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Anonymous users2024-02-07From 1 o'clock to 7 o'clock, the hour hand sweeps through the semicircle, sweeping the area:
s=squared 2
Cm.
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