Question

If the perimeter of a closed semicircle is 72 cm, then find its diameter.​

Answer 1

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Given ;-

Perimeter of Semi-circular Protractor = 72 cm.

Now , it gives out that ;-

=> 72 cm = πr + 2r

=> 72 cm = r ( π + 2 )

=> 72 cm = r ( 22 + 14 ) / 7

=> 72 cm = r ( 36 ) / 7

=> r = 72 × 7 / 36

=> r = 14 cm.

Hence ,

The diameter of the protractor is 14 cm.

Answer 2

Answer:

d = 21cm

Step-by-step explanation:

πd/2 + d = 72

That is : d(π+2) = 144

That is : d = 3 × 7

Therefore d= 21 cm