How to calculate Circumference of a circle using the radius?
According to the formula for the calculations of the circumference, it requires only radius(r).
Example-1 :
The radius of a circle is 7.5 inches. What is the circumference?
$$\text{C}\;=\;2πr$$
$$\text{C}\;=\;2(3.14)(7.5)$$
$$\text{C}\;=\;47.1\;\text{inches}$$
How to calculate Circumference of a circle using the diameter?
According to the formula for the calculations of the circumference, it requires only diameter(r).
Example-2:
The diameter of a circle is 5 centimetres. What is the circumference?
$$\text{C}\;=\;π\;*\;\text{d}$$
$$\text{C}\;=\;π\;*\;5$$
$$\text{C}\;=\;3.14\;*\;5$$
$$\text{C}\;=\;15.7\;\text{cm}$$