Question

a lawn is in the shape of a semicircle of diameter 7 M it is surrounded by a flower bed of width 0. 7 M all around .find the area of the flower bed in metre square

Answer 1

Answer:

16.94 m²

Step-by-step explanation:

diameter of the park=7 m

radius=diameter/2

radius=3.5 m (r)

as it surrounded by flowers,

width=0.7 m

so the bigger radius would be=3.5+0.7= 4.2 m (R)

area of path= area of bigger circle-area of smaller circle

area of flowerbed=π(R²-r²)

=22/7(4.2²-3.5²)

=22/7(17.64-12.25)

=22/7(5.39)

=16.94 m²

Answer 2

Answer:

8.47 cm²

Step-by-step explanation:

Radius of semicircle = 7/2 = 3.5 m. Now it is surrounded by flower bed of width 0.7 cm. So radius including flower bed R = 3.5 + 0.7 = 4.2 m. Now area of Lawn = pie r²/2 = 22/7 × 1/2 × 3.5 × 3.5 = 11 × 0.5 × 3.5 = 19.25 m². Area including flower bed = pie R²/2 = 22/7 × 1/2 × 4.2 × 4.2 = 11 × 0.6 × 4.2 = 27.72 m². So area of flower bed = 27.72 - 19.25 = 8.47 m² Please Mark me as brainliest ☺️