Question

If the measures of two of the angles of a triangle are 25 degrees and 60 degrees, then the third angle is _____.

Answer 1

Let the third angle be $x$.
We know that sum of all the interior angles of a triangle is ${180}^{\circ }$.
$\Rightarrow {25}^{\circ }+{60}^{\circ }+x={180}^{\circ }$
$\Rightarrow {85}^{\circ }+x={180}^{\circ }$
$\Rightarrow x={180}^{\circ }-{85}^{\circ }$
$\Rightarrow x={95}^{\circ }$