The given figure shows a semi - circle :
The semicircle has a circumference of 12 cm and the radius is 4 cm. Find the ratio between the circumference and the diameter if this is converted into a full circle.
3 : 1
The diameter of the full circle will be = 2 × radius = 2 × 4 = 8 cm
The circumference of the full circle will be 2 x12 = 24 cm
The ratio between circumference and diameter = 24 : 8 = 3 : 1