Math

Use our Triangle Inequality Theorem Calculator to quickly verify whether three given side lengths can form a valid triangle—by checking the essential inequality conditions—with clear, step-by-step explanations.

Use our Special Right Triangles Calculator to instantly find missing side lengths, area, perimeter, or height using one known value—based on predictable patterns in five common right triangle types—with clear, step-by-step solutions.

Use our Similar Triangle Calculator to find missing side lengths, scale factors, or verify triangle similarity using the three criteria — SSS, SAS, and AA — from any given values, complete with step-by-step solutions.

Use our Equilateral Triangle Calculator to find the side length, area, perimeter, height, or angle from any one known value, complete with step-by-step solutions.

Use our 45 45 90 Triangle Calculator to find the legs, hypotenuse, altitude (height), area, or perimeter from any one known value, complete with step-by-step solutions.

Use our 30 60 90 Triangle Calculator to find the short leg, long leg, hypotenuse, altitude (height), area, or perimeter from any one known value, with step-by-step solutions.

Use our Pythagorean Theorem Calculator to solve right-angled triangle problems—find sides, angles, triangle height, area, or perimeter with step-by-step solutions.