CPM Homework Help : INT3 Problem 1-62

Determine the value of $x$ in the diagram below. Justify your reasoning.

Triangle, with all 3 sides extended into lines. At left bottom vertex, angle above & left of both lines, labeled 150 degrees, At right bottom vertex, angle above & right of both lines, labeled, x, At top vertex, angle left & above both lines, labeled 140 degrees.

Hint:

Straight angles have a total of $180^\circ$ .

More Help:

Every triangle's interior angles also add up to $180^\circ$ .