23. 21 and 2 are vertical angles. If m21 -
(ár + 111) and m2 = (10x – 9)", find m2).

]supplementary angles are two angles that add up to . • complementary angles are two angles that add up to degrees. • adjacent angles share a and a • congruent angles have the measure. • an triangle has one angle that is greater than 90 degrees. • a triangle with angles 45°, 45°, and 90° would be a triangle