Question

a side of the triangle below has been extended to form an exterior angle of 66°. find the value of x.
18°
x° 66°
answer attempt 2 out of 3
x =

Explanation:

Step1: Recall exterior - angle property

The exterior angle of a triangle is equal to the sum of the two non - adjacent interior angles.
So, $66^{\circ}=18^{\circ}+x^{\circ}$.

Step2: Solve for $x$

Subtract $18^{\circ}$ from both sides of the equation: $x = 66 - 18$.

Answer:

$x = 48$