Question

if the perimeter of semi circular protractor is 66cm find its diameter

Answer 1

Answer:

25.6 cm

Step-by-step explanation:

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

where d is the diameter and d = 2r

r = radius

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

So, $66=\pi r+2r$

$66=r(3.14 +2)$

$66=r(5.14)$

$\frac{66}{5.14}=r$

$12.8=r$

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

Thus the diameter of the semi circular protractor is 25.6 cm

Answer 2

Answer:

25.6 cm

Perimeter of  semi circular  Protector =

where d is the diameter and d = 2r

r = radius

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

So,

 

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

Thus the diameter of the semi circular protractor is 25.6 cm