# How many right angles does a right triangle have?

Dec 25, 2015

A right triangle has only one right angle.

#### Explanation:

Since the sum of all angles in any triangle is equal to ${180}^{o}$, so there can be only one right angle if all other angles are to be greater than zero.

Let's assume that there are two right angles

The sum would be:

$s = 90 + 90 + C$

So the angle C would have to be zero, which is impossible.