Question

The diameter of a semi-circular protractor is 18 cm. Find its perimeter. (π=22/7)​

Answer 1

Answer:

Given πr+2r=18⇒ r=

7

22

+2

18

⇒r=

36

18×7

=3.5 cm

⇒Diameter=3.5 cm

Answer 2

Step-by-step explanation:

Diameter = 18 cm

Radius = Diameter/2 = 9 cm

Circumference of semicircle = πr

= 22/7 × 9 cm

= 198/7 cm

= 28.29 cm { approximately }

HOPE IT WILL HELP YOU.