Question

Find the perimeter of the composite figure below. (semicircle). Round to the nearest tenth. Use π = 3.14

Answer 1

take upper base = 12

take upper base = 12right side= 20

take upper base = 12right side= 20apply pythagorus

take upper base = 12right side= 20apply pythagorus .

take upper base = 12right side= 20apply pythagorus .= 13

now semi circle= 2 pi r/2 = pi × (11/2)

add all

12 +20+13× 5.5pi

Answer 2

64.27cm

Explanation:

Total perimeter =

semicircle + Length of rectangle + Breadth of rectangle and triangle +

hypotenuse of Triangle

semicircle = pi x r (r = radius)

= 3.14 x 11/2

= 17.27 cm -----------------(1)

Length of rectangle = 12cm (Given) ----------------------(2)

Base (rectangle and triangle) = 20cm (Given) --------------------(3)

Hypotenuse = Root of (20-11)^2 + 12^2

= Root of 9^2 + 12^2

= Root of 81 + 144

= Root of 225

= 15cm ---------------------------(4)

By adding (1), (2), (3) and (4) we get

= 17.27 + 12 + 20 + 15

= 64.27cm