the circular portions of figure are semi circle find 1)perimeter 2) area
plz tell both
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Answer:
1) perimeter = 96 cm
2) area = 346.5cm²
Step-by-step explanation:
l - length , b - breadth = 21cm , r - radius = 21/2cm , d - diameter =21cm
length of figure = 2(radius of semicircle) + length of rectangle
36 =diameter of semicircle + l
36 = 21 + l
36 - 21 = l
l = 15cm
1) Perimeter of figure
= 2 (length of rectangle) + 2 × (1/2 perimeter of circle)
= (2 × l) + 2 (1 / 2 × πd)
= (2 × 15) + πd
= 30 + (22 / 7 × 21)
= 30 + (22 × 3)
= 30 + 66
= 96cm
2) Area of figure
= 2 ( 1/2 × area of circle) + area of rectangle
= area of circle + area of rectangle
= πr² + lb
= 22 / 7 × 21 / 2 × 21 / 2
= 33 × 21 / 2
= 346.5cm²
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