Question

Find the area of the shaded region
18m, 16m, 20m​

Answer 1

Answer:

ANSWER

From figure,

Area of the shaded region is the difference between the areas of two semi circles with radius OB=7m and OA=5m respectively.

Area of semi circle with radius 'r' units =

2

1

πr

2

sq.units

Area of the shaded region =

2

1

OB

2

−

2

1

OA

2

=

2

1

(OB

2

−OA

2

)

=

2

1

(7

2

−5

2

)

=

2

1

(49−25)

=

2

1

(24)

=12

∴ The required area =12 sq.units