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The perimeter of the bottom surface of a cylindrical timber is 12.56 decimeters, and the height is 4 meters. (1) how many square meters is its surface area? (2) What is its volume in cubic centimeter? (3) if you cut it into three small cylinders, how many square decimeters will the surface area increase?
The circumference of the bottom surface of a cylindrical timber is 12.56 decimeters. The height is 4 meters
1. How many square meters is the surface area?
Radius: 12.56 ﹣ 3.14 ﹣ 2 = 2 decimeters
2 decimeters = 0.2 meters 12.56 decimeters = 1.256 meters
3.14 × 0.2 × 0.2 × 2 + 1.256 × 4 = 5.2752 M2
2. What is the volume of cubic decimeter?
4m = 40m
3.14 × 2 × 2 × 40 = 502.4 cubic decimeter
3. If you cut it into three small columns, how many square decimeters will the surface area increase
Four bottom areas were added
Radius: 12.56 ﹣ 3.14 ﹣ 2 = 2 decimeters
3.14 × 2 × 2 × 4 = 50.24 square decimeter
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