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Half of the length of a bundle of rope is less than 5 meters, and 56 meters are left. How long is the original rope
(56-5) △ 1 / 2 = 102m
A: the rope is 102 meters
After a rope is cut off 13, there is still 12.56 decimeters left. If the rope is cut off to form a circle, how many square decimeters is the area of the circle?
The circumference of the circle is: 12.56 △ 1-13) × 13, = 12.56 △ 23 × 13, = 6.28 (decimeter); the radius is: 6.28 △ 3.14 △ 2 = 1 (decimeter); the area is: 3.14 × 12 = 3.14 (square decimeter); a: the area of the circle is 3.14 square decimeter
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