Street Park to build a diameter of 12 meters of circular flower bed, around with tiles paved a 3 meter wide path, each tile area is 0.9 square meters Street Park to build a diameter of 12 meters of circular flower bed, around with tiles paved a 3 meter wide path, the area of each tile is 0.9 square meters, how many tiles to use to lay this path?

Street Park to build a diameter of 12 meters of circular flower bed, around with tiles paved a 3 meter wide path, each tile area is 0.9 square meters Street Park to build a diameter of 12 meters of circular flower bed, around with tiles paved a 3 meter wide path, the area of each tile is 0.9 square meters, how many tiles to use to lay this path?

｛〔（12+3+3）÷2〕×〔（12+3+3）÷2〕×π－（12÷2）×（12÷2）×π｝÷0.9=141.371667÷0.9=157.07963
Considering the gap between tiles, 156 tiles of 0.9 square meter are needed to pave the 3 meter wide road

There is a flower bed with a rectangular row. Its length is four times of its width, and its area is 25 square meters. Find out the length and width of this rectangle

Let the width be a meter
4a*a=25
4a^2=25
a^2=6.25
A = 2.5 (m) - width
2.5 * 4 = 10 (m) - length
A: the rectangle is 2.5 meters wide and 10 meters long
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A rectangular flower bed. 18 meters long and 15 meters wide. Add one meter floor tiles around the flower bed. How many square meters is the floor tile area

（18+1）*（15+1）-18*15=34

There is a flower bed 25 meters long and 20 meters wide. If a 3 meter wide path is built around the flower bed (as shown in the figure), what is the area of the path?

(25 + 3 + 3) × (20 + 3 + 3) - 25 × 20, = 31 × 26-500, = 806-500, = 306 (square meters). A: the area of the path is 306 square meters