The area of a circle is 78.5cm-178. How to calculate the diameter, radius and perimeter of a circle
Area of a circle
πr²=78.5
r=√﹙78.5÷π)
Circumference of circle = 2 π √ (78.5 △ π)
Area of a circle
πr²=78.5
r=√﹙78.5÷π)
Circumference of circle = 2 π √ (78.5 △ π)