Question

if the perimeter of a semicircular protractor is 36cm.then find its diameter​

Answer 1

Answer:

Perimeter of semicircular protractor=36 cm

πr+2r=36

⇒(π+2)r=36

⇒(  

7

22

​  

+2)r=36

⇒  

7

36

​  

r=36

⇒r=  

36

36×7

​  

 

⇒r=7  

Therefore, diameter =2r=2×7=14 cm