A triangle has three internal angles, each one bounded by a pair of adjacent edges; the sum of angles of a triangle always equals a straight angle (180 degrees or π radians). The triangle is a plane figure …

Math Warehouse's popular online triangle calculator: Enter any valid combination of sides/angles (3 sides, 2 sides and an angle or 2 angle and a 1 side) , and our calculator will do the rest!

Whether you have the base and height of the triangle, three sides, side-angle-side, or angle-side-angle, this versatile triangle area calculator will find the area of a triangle for you.

It is usual to name each vertex of a triangle with a single capital (upper-case) letter. The sides can be named with a single small (lower case) letter, and named after the opposite angle.

To explore the truth of this rule, try Math Warehouse's interactive triangle, which allows you to drag around the different sides of a triangle and explore the relationship between the angles and sides.

Jan 16, 2026 · triangle, in geometry, a three-sided polygon. Triangles are formed by three line segments, sometimes called edges, whose end points intersect at points known as the vertices. The seemingly …

How to find the area of a triangle? The area of a triangle is the total space occupied by the three sides of a triangle in a 2-dimensional plane. Explore more about the area of triangle formula with solved …