Question

the circumference of a semicircle is 66 cm. Find its radius

plz show step by step.plz

Answer 1

Answer:

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

Answer 2

Answer:

25.6 cm

Step-by-step explanation:

Perimeter of semi circular Protector = \pi r+dπr+d

where d is the diameter and d = 2r

r = radius

Since we are given that the perimeter of semi circular protractor is 66cm

So, 66=\pi r+2r66=πr+2r

66=r(3.14 +2)66=r(3.14+2)

66=r(5.14)66=r(5.14)

\frac{66}{5.14}=r

5.14

66

=r

12.8=r12.8=r

Thus the diameter = 2r = 2*12.8 =25.6 cm

Thus the diameter of the semi circular protractor is 25.6 cm

Step-by-step explanation:

I Hope it is helpful.