In the diagram, the measure of angle 9 is 85°.


4 lines intersect to form 16 angles. The angles created, clockwise from top left are 1, 2, 3, 4; 5, 6, 7, 8; 9, 10, 11, 12; 13, 14, 15, 16.


Which angle must also measure 85°?

Angle2

Angle5

Angle11

Angle12

In the diagram the measure of angle 9 is 854 lines intersect to form 16 angles The angles created clockwise from top left are 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 class=