Question

The measure of each of two angles of a triangle is $70°.$ The measure of a third angle is$\_\_\_$

Answer 1

Given

The measure of each of two equal angles$=70°$

Let the third angle be $x$

$\because$ The sum of all angles in a triangle is$180°$

$$\begin{gathered} \Rightarrow 70+70+x=180 \\ \Rightarrow 140+x=180 \\ \Rightarrow x=180-140 \\ \Rightarrow x=40° \end{gathered}$$

Hence, the measure of the third angle is $40°$