As shown in the picture, a 65 meter long bamboo fence is used to surround a flower garden on the open space near the wall. The area of the flower garden is______ Square meters

As shown in the picture, a 65 meter long bamboo fence is used to surround a flower garden on the open space near the wall. The area of the flower garden is______ Square meters

(65-30) × 30 / 2, = 35 × 30 / 2, = 525 square meters. A: the area of this garden is 525 square meters

Wang Ye enclosed a semi-circular flower garden with a 12.56-meter-long fence against the wall. 25% of the flower garden is planted with roses. How many square meters is the area for planting roses?
And why every step

According to the conditions, the arc length of the semicircle is 12.56m
The radius of semicircle is 12.56 / 3.14 = 4m
The semicircle area is 3.14 * 4 * 4 / 2 = 25.12m2
So the area of planting roses is 25.12 * 25% = 6.28 square meters

Wan Dabo uses a 100 meter long bamboo fence to enclose a flower garden in an open space near the wall (as shown in the picture). How many square meters is the area of this flower garden?

(100-30) × 30 / 2, = 70 × 30 / 2, = 1050 square meters. A: the area of this garden is 1050 square meters