# Table of Contents

Formula for the area of a triangle using the base and the height

How to find the area of a triangle using its sides. Heron’s formula

The area of a triangle from two sides and the included angle

How to find the area of a triangle from 3 angles and a side or from 2 angles and a side

The area of a triangle using two sides and the sine of the exterior angle

Formula of the area of a triangle using three heights

Formula of the area of a triangle from three medians

How to find the area of a triangle in terms of the inscribed circle’s radius

How to find the area of a triangle in terms of the circumscribed circle’s radius

Theorems on similarity of the areas of the triangles

Triangles which have equal areas