The perimeter of a semi-circular lawn is 30.84 meters. How many square meters is the area of this lawn?

The perimeter of a semi-circular lawn is 30.84 meters. How many square meters is the area of this lawn?

Suppose that the diameter of the round lawn is d meters, 3.14 × D △ 2 + D = 30.84 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 2.57d = 30.84 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; d = 12, the area is 3.14 × (12 △ 2) 2 △ 2 = 3.14 × 36 △ 2 = 5

The diameter of a round nursery is 9m. What is its perimeter and area?

Radius 4.5
Perimeter. 2 * 3.14 * 4.5 = 28.26
Area 3.14 * 4.5 * 4.5 = 63.585
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There is a round flower bed, its perimeter is 25.12 meters, what is the floor area of this flower bed?

2 = 3.14 × 42 = 3.14 × 16 = 50.24 square meters. A: this garden covers an area of 50.24 square meters

How many square meters does a circular sand pile with a circumference of 47.1 meters cover?

47.1 ﹣ 3.14 ﹣ 2 = 7.5 (m), 3.14 × 7.52, = 3.14 × 56.25, = 176.625 (M2), a: the floor area is 176.625 m2

The perimeter of a circular flower garden is 62.8 meters. What is its floor area?
2. Cut a piece of 24 decimeter square paper into the largest circle. What is the circumference and area of the circle?
3. The minute hand of a watch is 2 cm long. How many meters does the tip of the watch walk day and night?
4. Acrobats perform unicycle walking on steel wire. The diameter of the wheel is 50cm. How many cycles does the wheel have to roll to ride 94.2m long steel wire?
twenty

314 square meters
2. Radius 3, area 9,
3.96cm
four point six zero

The perimeter of a circular flower garden is 28 or 26 meters. What is its floor area

First, we use the circumference to calculate the radius, and then use the area formula to calculate the area,

A round pool, 28.26 meters in circumference, its area is______ Square meters

2 = 3.14 × 4.52 = 3.14 × 20.25 = 63.585 square meters. Answer: the area of this pool is 63.585 square meters. So the answer is: 63.585 square meters

To build a cylindrical fountain pool in the municipal square, tiles should be pasted on the wall and bottom of the pool. The diameter of the pool bottom is 28 meters, the depth of the pool is 1.2 meters, and the area of tiles should be covered

Area = bottom area + side area = square of bottom radius times π + bottom perimeter times height = 14 * 14 * 3.14 + 2 * 3.14 * 14 * 1.2 = 615.44 + 105.504 = 720.944 square meters

A cylindrical pool, the inner wall and bottom of the pool are pasted with ceramic tiles, the bottom diameter of the pool is 4m, the pool depth is 1.5m, and the area to be pasted with ceramic tiles is smaller

Radius 4 △ 2 = 2m
the measure of area
2x2x3.14+4x3.14x1.5
=12.56+18.84
=31.4 square meters
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For a cylindrical pool, the inner wall and bottom of the pool should be pasted with ceramic tiles. If the inner diameter of the pool bottom is 6 meters and the pool depth is 1.2 meters, what is the area of the tile
square meter?

6 / 2 = 3M
3.14*6*1.2+3.14*3*3
=22.608+28.26
=868 square meters