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Answers
Answer:
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Step-by-step explanation:
6 a) Radius of bigger circle= 14 cm
Radius of smaller circle= 7 cm
Area of bigger circle= 22/7× 14
= 44 cm²
Area of smaller circle= 22/7 × 7
= 22 cm²
Area of shaded portion= 44 cm² - 22 cm²
= 22 cm²
6 b) Radius of circle = 10 cm
Area of circle = 22/7×10
= 220/7
= 31.41 cm²
Area of triangle= 1/2×12×16
= 96 cm²
Area of shaded portion= 96 cm² - 31.41 cm²
= 64.59 cm²
6 c) As breadth of the rectangle is 8 cm, its length would be 16 cm. explained as follows:-
- 8 cm is breadth of rectangle and also the diameter of the circle.
- Vertically also the diameter will remain the same.
- As there are 2 circles then the diameter of both will also be double.
- So the length will be 16 cm
Area of rectangle = 16×8
= 128 cm²
Area of 2 circles = 22/7×4
= 88/7
= 12.56 cm² × 2
= 25.12 cm²
Area of shaded portion= 128 cm² - 25.12 cm²
= 102.88 cm²
6 d) Area of bigger semicircle = 22/7×7÷2 (÷ 2 bcoz its half of a circle)
= 11 cm²
Area of smaller semicircle = 22/7×3.5÷2
= 5.5 cm²
Area of shaded portion = 11 cm² - 5.5 cm²
= 5.5 cm²