P

i have a new question which is : how do you find the circumference of a circle if you have the diameter?, thanks

If you have the diameter of a circle then the circumference can be found by multiplying the circumference by Pi. Pi is a mathematical constant equal to 3.142 (to 3 d p)

Example

A circle has a diameter of 15cm. Work out the circumference.

All you need to do is multiply the 15 by Pi:

3.142 x 15 = 47.1cm to 1 decimal place.

The formula for the circumference of a circle is 2 x pi x radius.

Now since the diameter = 2 x radius,

The circumference is pi x diameter.

Circulference = pi x diameter

pi = 3.14

if the diameter is 5, multiply 5 with 3.14 to get the circumference

circumference = 15.7

Just multiply the diameter of the circle with PI(3.142)

If 'd' is the diameter of the circle then the circumference is = PI*d