Mathematics, 26.04.2021 21:30, love123jones

Lamar wanted to explain why the measure of angle 5 is equal to the sum of the measures of angles 1 and 3. A triangle with angles 1, 2, 3. The exterior angle to angle 1 is 4, to 2 is 5, to 3 is 6.

Which geometry concepts should be used in Lamar’s work?
supplementary angles and the sum of the measures of interior angles of a triangle
complementary angles and the sum of the measures of interior angles of a triangle
supplementary angles and vertical angles
the sum of the measures of interior angles of a triangle and vertical angles

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Lamar wanted to explain why the measure of angle 5 is equal to the sum of the measures of angles 1 a...