Question

8) If 2 known angles in a triangle measure 100 degrees and 60 degrees, what must be the measure of the 3rd angle? *

Answer 1

The measure of the 3rd angle is 20 degrees

Here, we want to get the value of the missing angle of the triangle

Mathematically, the sum of the interior angles in a triangle is 180 degrees

Let the missing third angle be x

We have;

$\begin{gathered} x\text{ + 100 + 60 = 180} \\ x\text{ = 180-100-60} \\ x\text{ = 20} \end{gathered}$