Find the area of Shaded region
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radius of bigger semi circle = 9÷2 = 4.5 cm
area of bigger semi circle = 1/2 πr²
= 1/2 × 22/7 × 45/10 × 45/10
= 11 /7 × 2025/100
= 22275÷700
= 31.82 cm²
area of shaded semi circle = 1/2 πr²
= 1/2 × 22/7 × 3/2 ×3/2
= 11/7 ×9/4
= 99÷28
= 3.53 cm²
area of unshaded 3 semi circles = 3/2 πr²
= 3/2 × 22/7 × 3/2 ×3/2
= 33/7 × 9/4
= 297÷28
= 10.60 cm
area of shaded region = 31.82 + 3.53 -10.60
= 24.75 cm²
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