The figure shows one big quadrant and two small semicircles. The radius of the big quadrant is 66 m.
- Find the perimeter of the shaded figure. (Take π = 3.14)
- Find the shaded area of this figure. (Take π = 3.14)
(a)
Circumference of the small circle
= 3.14 x 66
= 207.24 m
Diameter of the big quadrant
= 66 x 2
= 132 m
Circumference of the big quadrant
= 3.14 x 132 x
14= 103.62 m
Perimeter of the shaded figure
= 207.24 + 103.62
= 310.86 m
(b)
Area of the big quadrant
= 3.14 x 66 x 66 x
14 = 3419.46 m
2 Area of the triangle
=
12 x 66 x 66
= 2178 m
2 Area of shaded area
= 3419.46 - 2178
= 1241.46 m
2 Answer(s): (a) 310.86 m; (b) 1241.46 m
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