Question

Find the value of x in each triangle. show your work on a separate piece of paper

Answer 1

x = 70°

Explanation:

the interior angle which is supplemental to 140° is 40°

the sum of the interior angles of any triangle is 180°

so:

180° = 40° + 2x

subtract 40° from each side of the equation:

2x = 140°

x = 70°