Question

If the perimeter of protactor is 66cm find the radius of the protactor

Answer 1

Answer:

I hope it will help you.

Step-by-step explanation:

The perimeter of protactor:66cm

As we know that the shape of protactor is semicircle.

So,the perimeter of semicircle

$\frac{1}{2} \times \pi \times diameter$

But here perimeter is given,So diameter:

$66 \div \frac{1}{2} \div \frac{22}{7 } = 42$

If we find diameter;then the radius will be:

$d \div 2 \\ 42 \div 2 = 21$

So,the radius is 21cm