Triangle Area Calculator

Triangle Area Calculator

Class 9–10 • Multiple methods • Step-by-step

Enter values in the side panel or click labels on the triangle. Once enough data is given, the triangle redraws and area is found by different methods.

Side Angle Height Computed
Click a label (a, b, c, A, B, C or h) or use the side panel

Sides

Angles (degrees)

Height (to side a)

Result

— sq units

Side a is opposite angle A, and so on. Height h is the altitude to side a.

Step-by-step (Class 9 methods)

1. Heron's formula

Needs all three sides a, b, c.

2. ½ ab sin C

Needs two sides and the included angle.

3. ½ × base × height

Needs base a and height h.