Question

What is the difference between radius & diameter?

Answer 1

Diameter is the longest line that you can draw in a circle passing through the centre of the circle.
Radius is the line joining the centre of the circle to any point on the circumference.

Explanation:

Diameter is the ratio of the circumference of the circle to the irrational constant 'pi' (3.1415...). Radius is the half of the diameter.

`D = 2 xx radius" and " radius = D/2`

Actually pi is defined to be the ratio of the circumference of the circle to the diameter of the circle. Therefore, you can solve for the diameter from that equation.

`pi = C/D, " or " D = C/pi " or " C = pi xxD`