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Cut a 4-meter-long circle into three sections and increase its surface area by 8 square decimeters. What is the volume of this log?
Cross section: 8 ÷ (2 × 2) = 2 square decimeters
4m = 40m
Volume: 2 × 40 = 80 cubic decimeter
When a 2-meter-long log is cut into three sections, its surface area increases by 2.512 square decimeters. How cubic decimeters is the volume of the log?
Floor area = 25.12 △ 4 = 6.28 square decimeters
Volume = 6.28 × 20 = 125.6 cubic decimeter
A ribbon is 18.84 decimeters long. Cut two-thirds of it to make a round stage prop. What's the radius of the prop
The circumference of the circle: 18.84x2/3 = 12.56 (decimeter) the diameter of the circle: 12.56 △ 3.14 = 4 (decimeter) the radius of this prop is: 4 △ 2 = 2 (decimeter). Please click the "adopt the answer" button below to send us a little red flower for encouragement!
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