MathLab with Mr. Ahmed

MathLab with Mr. Ahmed is a math learning website by Ahmed Amasha, a mathematics teacher teaching the American curriculum. Explore Algebra 2, Precalculus, Calculus, and SAT and PSAT Math Prep through lessons, focused practice and printable resources.

MathLabwith Mr. Ahmed
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Lines, angles and triangles

Question 1 of 3

Know the idea

In triangle ABCABC, the measure of angle AA is 28∘28^{\circ} and the measure of angle BB is 73∘73^{\circ}. What is the measure, in degrees, of angle CC?
Worked example
The angles of a triangle add to 180∘180^{\circ}: 180−28−73=79180 - 28 - 73 = 79.
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An exterior angle of a triangle measures 7777 degrees. One of the two nonadjacent interior angles measures 4242 degrees. What is the measure, in degrees, of the other nonadjacent interior angle?