Question

341

42
21 and 2 are supplementary angles.
The m/1 102 degrees.
The measure of <2 =??
degrees

Answer 1

∠ 2 = 78°

Explanation:

supplementary angles , sum to 180° , then

∠ 1 + ∠ 2 = 180° , that is

102° + ∠ 2 = 180° ( subtract 102° from both sides )

∠ 2 = 78°