Question

problem 20: find y. (first taught in lesson 31) after you enter your answer press go. y =

Explanation:

Step1: Recall angle - sum property

The sum of the interior angles of a triangle is $180^{\circ}$. The non - adjacent interior angles of the triangle are $89^{\circ}$ and $23^{\circ}$.

Step2: Calculate the exterior angle

The exterior angle $y$ of a triangle is equal to the sum of the two non - adjacent interior angles. So $y=89 + 23$.

Step3: Perform addition

$y=112^{\circ}$.

Answer:

$112$