The circumference C of a circle with radius r is calculated using the formula below.
C=2Ï€ r
Let's now consider the given diagram.
From the figure, we know that the radius of the circle is 4mm. We can substitute this value for r in the formula for the circumference of a circle and simplify.
The circumference of the circle is approximately 25.1mm.
Area
Similar to the perimeter, the area of a circle with radius r is calculated using the formula below.
A=Ï€ r^2
We know that the radius of the circle is 4m. By substituting 4 for r in the formula, we can calculate A.
