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Area of an Equilateral Triangle
A = (√3/4) a²
Where: A = Area, a = side
Use the same units for all lengths (e.g. all in cm); areas come out in cm², volumes in cm³.
Solved example
Given: a = 7
Find: A (Area)
- Formula: A = √(3)·a²/4
- Substitute the values: A = √(3)·7²/4
- Result: A = 21.217622
Answer: A = 21.217622
Calculator
How to calculate Area of an Equilateral Triangle
- Write down the formula: A = (√3/4) a².
- Note the known values (a).
- 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 an Equilateral Triangle?
The formula is A = (√3/4) a², where A = Area, a = side.
What is Area of an Equilateral Triangle when a = 7?
A = 21.217622. Substitute the values into A = (√3/4) a² and simplify.