Question

If the perimeter of a semicircular protractor is 36 cm , find its diameter

Answer 1

Hii Mate here is your answer,

$perimeter(circle) = 2\pi \times r$

$p(semicircle) = \pi \times r + d$

Now insert the given values,

Semicircle perimeter= 36cm

pie = 22/7

d = ?
r= d/2 ........ property of circle

$36 =22 \div 7 \times d \div 2 + d$

$36 = 22d \div 14 + d$

36 = 22d/14 + d .......... Take 14 as LCM

36=( 22d+14d)/14

36×14 = 36d

d = 36×14/36 ............ 36:cancelled out

d = 14 cm

Hence the diamtetre of the circle is 14cm

Hope this helps you a lot......☺☺☆☆☆☆

Answer 2

Answer:

14cm

Step-by-step explanation: