A sidewalk is 40 meters long and 8 meters wide. It is paved with cement bricks with an area of 25 square decimeters. It needs more cement bricks

A sidewalk is 40 meters long and 8 meters wide. It is paved with cement bricks with an area of 25 square decimeters. It needs more cement bricks


Need such cement brick: 40x8 / (0.25) = 1280 pieces



A cone has a base circumference of 25.12 decimeters, a volume of 452.16 cubic decimeters and a height of () decimeters


bubble is flying 6.
Bottom area: 3.14 × (25.12 / 3.14 / 2) &# 178; = 50.24 (square decimeter)
Cone height: 452.16 △ 50.24 △ 1 / 3 = 27 (decimeter)