Chapter 11.2, Problem 3GP

To determine

To find: Value of $x$ in each triangle.

Answer to Problem 3GP

  $x={45}^0$

Explanation of Solution

Given information:

Two angles of a triangle are ${90}^0$ and ${45}^0$

Given

Two angles of a triangle are ${90}^0$ and ${45}^0$

We know sum of angles of a triangle is ${180}^0$

Using that

We get

  $x^0+{45}^0+{90}^0={180}^0$

On solving

  $\begin{array}{l}{x}^0+{45}^0+{90}^0={180}^0\\ \Rightarrow x^0+{135}^0={180}^0\\ \Rightarrow x^0={180}^0-{135}^0\\ \Rightarrow x^0={45}^0\end{array}$

Therefore,

  $x={45}^0$

As two angles and two sides are equal and one of the angle is ${90}^0$

So, it is an Right angled issoceless triangle