Question

Sum of two angles of a triangle is ${90}^{\circ }$. Find the third angle. What type of triangle is this.

Answer 1

Let the angles be A, B, C

So $A+B={90}^o$

By angle sum property $\Rightarrow A+B+C={180}^o$

$\Rightarrow {90}^o+C={180}^o$

$\Rightarrow C={90}^o$

It is a right angle triangle.