Right Triangle Calculator

A right triangle is a geometrical shape in which one of its angle is exactly 90 degrees and hence it is named as right angled triangle. It has a base side, a hypotenuse and height of the triangle. We know that hypotenuse = √(Base^2 + Height^2). This right triangle calculator helps you to calculate angle and sides of a triangle with the other known values. You can select the angle and side you need to calculate and enter the other needed values.

Calculate Angle and Sides of a Triangle

I want to calculate &
Opposite Side
Hypotenuse Side
Adjacent Side
Angle q
Angle b = (90-q)
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Right Angle Triangle Angles Formula : Sin (q) = Old/Harry = Opposite/Hypotenuse
Cos (q) = And/His = Adjacent/Hypotenuse
Tan (q) = Old/Aunt = Opposite/Adjacent
Angle b = (90 - q)
Hypotenuse = √(Base^2 + Height^2)

The formulae (formula) for calculating angle and sides of a triangle can be easily remembered using the sentence -Old Harry And His Old Aunt.


A right triangle with 5 cm as base and 10 cm as height, will have an hypotenuse value of

= √(5^2 + 10^2)
= √(25 + 100)
= √(125)
= 11.18 cm

Substituting the hypotenuse and opposite side values in the Sin q formula, we have
Sin q = 10 / 11.18
= 63.43 degrees

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