Question

the circular portions of figure are semi circle find 1)perimeter 2) area
plz tell both ​

Answer 1

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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