Isosceles Triangle Calculator & Solver

This calculator helps you to practice on isosceles triangle problems and questions and check your results.

Calculators to solve isosceles triangle problems depending on which sides and angles you are given. The figure shown below will be used for sides and angle notations.
An isosceles triangle has two sides that are equal called legs. In the triangle below sides AC and AB are equal. Since the legs are equal, the base angles B and C are also equal. Angle A is called the vertex. Side BC is called the base.

Isosceles triangle with vertices A (top), B (bottom left), C (bottom right). Sides: AB = AC (legs), BC (base). Angles: A (vertex), B and C (base angles)

Vertex A at top, base BC, legs AB = AC

Select Calculation Mode:

Current Mode: Mode 1 - Base a and Leg b

Mode 1: Given base a and leg b

Enter base a and leg b (legs are equal) as positive real numbers

Decimal Places

Leg c --

Base a --

Angle A (vertex) -- °

Angle B (base) -- °

Angle C (base) -- °

Area --

Perimeter --

Step-by-Step Solution

Select values and calculate to see solution steps.

Isosceles Triangle Calculator & Solver

Mode 1: Given base a and leg b

Step-by-Step Solution

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