What is the sum of the measures of the four angles formed by intersecting lines?
Two opposite diagonal lines intersect, creating 4 angles. The top angle is labeled, 1; the right is labeled, 2; the bottom is labeled, 3; the left is labeled, 4.
Two opposite diagonal lines intersect, creating 4 angles. The top angle is labeled, 1; the right is labeled, 2; the bottom is labeled, 3; the left is labeled, 4.