Question

. If the perimeter of a semicircular protractor is 66cm, find the diameter of the protractor.​

Answer 1

Step-by-step explanation:

Let the radius of the protractor be r cm.

Then, Perimeter=66cm

⇒πr+2r=66

⇒r[

7

22

+2]=66

⇒r(

7

36

)=66

⇒r=

36

66×7

⇒r=

6

77

∴ Diameter =2r=

3

77