Question

Can a triangle have $3$ right angles?

Answer 1

Since the sum of the interior angles in a triangle must be $180$ degrees.

For example, if we have more than one right angle then the sum of angles of the triangle will be more than $180$ degrees

$\Rightarrow$$\angle A+\angle B+\angle C=180°$

$\Rightarrow$$90°+90°+90°=180°$

$\Rightarrow 270°\ne 180°$

Hence, a triangle cannot have $3$ right angles.