Question

If the perimeter of protractor is 90 cm .Find the radius of the protractor ( use π=22/7)

Answer 1

Hi there !!

Perimeter = 90 cm

We know that circumference of a full circle is 2πr

So ,

perimeter of semi circle [ protractor ] = 1/2 x 2πr

= πr

πr = 90 cm

22/7 x r = 90 cm

r = 90×7/22

r = 28.63 cm ( approx.)