It is the sum of its 4 sides
Pi can be used to calculate the area of a circle Pi can be used to calculate the circumference of a circle
To calculate the area of a circle use this formula: pi x r2.
The radius of a circle is half of its diameter.
Radius of a circle = diameter/2
Width Of Circle X 3.14 or PII
A circle is two dimensional, it has area but not volume.
The answer depends on what characteristic of a half circle you want to calculate: its area or perimeter or something else.
To calculate the area of a circle, you can use the formula A = Οr^2, where A is the area and r is the radius of the circle. Simply square the radius, multiply it by Ο (approximately 3.14159), and you will have the area of the circle.
A simple formula to calculate the circumference of a circle: so in this case:
You use a protractor.
Any circle will work!