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13) a)
Area of shaded portion = Area of square - Area of circle
= s × s - πr^2
= 14 × 14 - 22/7 × 7 × 7 (since d=14, r = 7)
= 196 - 154
= 42 square cm.
b)
The four quarter circles make up a full circle if joined together.
So,
Area of shaded portion = Area of square - Area of four quarter circles
= Area of square - Area of circle
= s × s - πr^2
= 30 × 30 - 22/7 × 7 × 7
= 900 - 154
= 746 square cm
Area of shaded portion = Area of square - Area of circle
= s × s - πr^2
= 14 × 14 - 22/7 × 7 × 7 (since d=14, r = 7)
= 196 - 154
= 42 square cm.
b)
The four quarter circles make up a full circle if joined together.
So,
Area of shaded portion = Area of square - Area of four quarter circles
= Area of square - Area of circle
= s × s - πr^2
= 30 × 30 - 22/7 × 7 × 7
= 900 - 154
= 746 square cm
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