Question

Find the difference between the perimeter of two circular plates, if one has a radius of 16.8 cm and the other has a diameter of 16.8 cm.

Answer 1

Pls check the attached pic...
Hope it helps you....

Answer 2

The difference between their perimeter is 52.8 cm

Given data :

Radius of the first circle = 16.8 cm

Diameter of the second circle = 16.8 cm

Radius of the second circle = 16.8/2 = 8.4 cm

So, perimeter of the first circle = 2 × π × 16.8 = 2 × 22/7 × 16.8 = 105.6 cm

So,the perimeter of the second circle = 2 × π × 8.4 = 2 × 22/7 × 8.4 = 52.8 cm

Difference = (105.6-52.8) = 52.8 cm (answer)