Is it a Right Triangle Calculator

This is it a right triangle calculator will help you determine whether or not a triangle qualifies to be a right triangle. This tool will be your companion when you just want to make sure you have a right triangle. In this right triangle calculator, you will learn:

• What a right triangle is; and
• How to figure out if a triangle is a right triangle using our calculator.

You're on the right track, so keep on reading.

A right triangle is a triangle with one of its interior angles equal to 90°, hence the name. Since a triangle has a total of 180° for its interior angles, if one of its angles is 90°, that means its two remaining interior angles have a total of 90°, too. So to check if a triangle is right, its two remaining angles need to be complementary and acute (since every complementary angle is acute). In equation form, we express that as:

where:

• $\alpha$ and $\beta$ - Remaining angles of a right triangle that turn out to be complementary.

Aside from the relationship of the interior angles of a right triangle, its sides should also follow the Pythagorean theorem. That means that a right triangle has to have a hypotenuse, which we can denote as $c$, which has a length equal to:

where:

• $a$ and $b$ - Sides of the triangle forming a right angle.

Lastly, we can observe the following trigonometric functions when dealing with right triangles:

For angle $\alpha$:

For angle $\beta$:

Note that:

• $a$ - Length of side opposite angle $\alpha$;
• $b$ - Length of side opposite angle $\beta$; and
• $c$ - Length of the hypotenuse, or the side opposite the 90° angle.

If a triangle fails to meet even one of these conditions, then that triangle is not a right triangle.

You can check your triangle in three different ways depending on the known parameters of the triangle you have. To use our right triangle calculator:

1. Choose in the Given selection your known set of parameters whether you know the 3 sides, angles α and β, or 2 sides and 1 angle.
2. Skip this step if you choose any of the first two options. If you chose 2 sides and 1 angle, select among the options which sides and angle you know.
3. Enter your known measurements depending on your selections.

After entering your last known parameter, our calculator will then display a message if your triangle is a right triangle or not.

Want to learn more about triangles? Here are our other triangle calculators you can explore:

• Right triangle side and angle calculator;
• Triangle side calculator;
• Missing side of a triangle calculator;
• Triangle length calculator;
• Triangle degree calculator;
• Triangle side and angle calculator;
• Similar right triangles calculator;
• abc triangle calculator;
• Angle of right triangle calculator; and
• Check similarity in right triangles calculator.