Question

a side of the triangle below has been extended to form an exterior angle of 70°. find the value of $x$. answer attempt 1 out of 2 $x =$

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, $70^{\circ}=x^{\circ}+49^{\circ}$.

Step2: Solve for $x$

Subtract $49^{\circ}$ from both sides of the equation: $x = 70 - 49$.

Answer:

$21$