Triangle ABC Triangle ABC
m21 m22 m23
100°
60°
40°
130°
50°
80°
140°
850
55°
50°
15°
35°
Which statement is true for all triangles with exterior angle 1 and remote interior angles
2 and 3?
A. The measure of 23 is equal to the sum of the measures of 21 and 22 because
of the definition of remote interior angles.
B. 21 and 23 are alternate interior angles because two line segments are cut by a
transversal.
C. The measure of 21 is equal to the sum of the measures of 22 and 23 because
of the exterior angle theorem.
D. 21 and 22 are supplementary angles because they form a linear pair.