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What is the formula for area of a half circle but you don't have the radius?
Wiki User
∙ 14y ago
If you have the diameter, then the formula for the area of a semi-circle is:
(pi x (diameter/2)2)/2
That is,
- Divide the diameter in two to find the radius (diameter/2)
- Square the radius (radius x radius)
- Multiply it by pi (3.1416)
- Divide the answer by two to find half the circle.
- Remember your units. The answer will be in square inches, or square centimeters or square somethings.
Wiki User
∙ 14y ago
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