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Area of a Semicircle
A = ½πr²
Where: A = Area, r = radius
Use the same units for all lengths (e.g. all in cm); areas come out in cm², volumes in cm³.
Solved example
Given: r = 7
Find: A (Area)
- Formula: A = π·r²/2
- Substitute the values: A = π·7²/2
- Result: A = 76.96902
Answer: A = 76.96902
Calculator
How to calculate Area of a Semicircle
- Write down the formula: A = ½πr².
- Note the known values (r).
- Substitute them and simplify to find A.
- Use the calculator above to solve for any letter.
Frequently asked questions
What is the formula for Area of a Semicircle?
The formula is A = ½πr², where A = Area, r = radius.
What is Area of a Semicircle when r = 7?
A = 76.96902. Substitute the values into A = ½πr² and simplify.