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A square wood is 2 meters long and its cross section is a square with a side length of 1 decimeter. How many square decimeters is its surface area? How many cubic centimeters is its surface area?
2 meters = 20 decimeters surface area: 2 × (1 × 20 + 20 × 1 + 1 × 1) = 82 (square decimeters) your second question should be volume: 20 × 1 × 1 = 20 (cubic decimeters) = 20000 cubic centimeters
Sawing a 2-meter-long square wood (with a square bottom) into three sections, increasing the surface area by 5.76 square decimeters. What is the original volume of this square wood?
2 meters = 20 decimeters, 5.76 △ 4 × 20 = 1.44 × 20 = 28.8 cubic decimeters. A: the volume of this square wood is 28.8 cubic decimeters
Saw a 6-meter-long square wood (the bottom is a square) into three sections, increasing the surface area by 9 square decimeters. What is the original volume of this square wood
9 / 4 = 2.25 square decimeter
6m = 60m
2.25 * 60 = 135 cubic decimeter
That's right
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