Question

Perimeter of semicircle is 36cm. What is the length of diameter?

Answer 1

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Perimeter of a semicircle = πr + d

B.T.P ,

πr + d = 36

=> πr + 2 r = 36

=> r ( π + 2 ) = 36

=> r = 36/ ( π + 2 )

=> r = 36 / 2 + 22 / 7

=> r = 36 × 7 / 36

=> r = 7 cm.

Diameter = ( 2×7 )cm = 14cm.

Answer 2

Answer:

14 cm

Step-by-step explanation:

Perimeter of a semicircle = πr + 2r

Given that the perimeter is 36 cm

πr + 2r = 36

r(π + 2) = 36

r = 36 ÷ (π + 2)

r = 7 cm

Find the diameter:

Diameter = 2 x radius

Diameter = 2 x 7 = 14 cm

Answer: The diameter is 14 cm