Quick answer
A equilateral triangle is a triangle with three equal sides and three equal angles of 60°.
- Main formula
- Area = (√3/4)a².
- Quick example
- The perimeter is found by adding the three sides.
How to identify it
Look at the side lengths and angle measures. A clear sketch usually makes the classification immediate.
Main formula
Area = (√3/4)a².
Practice tip
When a height is not shown, draw it perpendicular to the base before calculating area.