When Two Lines Intersect as in the Illustration Below, Four

Multiple Choice

When two lines intersect as in the illustration below, four angles are formed. Angles that are side-by-side, such as and , are called adjacent angles. Angles that are nonadjacent, such as and or and , are called vertical angles. From geometry, we know that if two lines intersect, vertical angles have the same measure. If and , find x . Read as "the measure of ".

A) x = 11
B) x = 15
C) x = 6
D) x = 8
E) x = 10