# What is the third angle of a right triangle if one of the angles measures 51?

Nov 14, 2016

$\text{third angle} = {39}^{\circ}$
The $\textcolor{b l u e}{\text{sum of the 3 angles in a triangle is }}$ ${180}^{\circ}$
here we have 2 angles of size ${90}^{\circ} \text{ and } {51}^{\circ}$
$\Rightarrow \text{ third angle} = 180 - \left(90 + 51\right) = 180 - 141 = {39}^{\circ}$