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The diameter of a circular flower bed is 6 meters, and the area of the flower bed is, the total length of the fence around the flower bed
Floor area: 3.14 × (6 △ 2) &# 178; = 28.26 square meters
Fence length: 3.14 × 6 = 18.84m
1. The fence of a round flower garden is 25.12 meters long. What's the area of it? 2. The outside diameter of the cylindrical wooden barrel at home is 6 decimeters
1. The fence of a round flower garden is 25.12 meters long. What's the area?
2. The outside diameter of the cylindrical wooden barrel at home is 6 decimeters. How many meters is it at least to add an iron basket to the barrel? (excluding the joint)
（1）
Radius = 25.12 △ 3.14 △ 2 = 4 (m)
Area = 3.14 × 4 × 4 = 50.24 (M2)
（2）
3.14 × 6 = 18.84 (decimeter) = 1.884 (meter)
The diameter of the circular flower bed is 10 meters, and a fence is built in the same circle. How long is the fence? How many square meters is the area of the flower bed?
3.14 × 10 = 31.4 (m)
3.14 × (10 △ 2) &# 178; = 78.5 (M2)
A: the fence is 31.4 meters long and the flower bed covers an area of 78.5 square meters
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