Angles with Equations

Master angles with equations! Practice complementary & supplementary angles using algebra.

Match each word with its correct definition. Right An angle that measures 90 degrees. Straight An angle that measures 180 degrees. Complementary Two angles whose sum is 90 degrees. Supplementary Two angles whose sum is 180 degrees Two angles are complementary. One angle has a measure of x˚ and the other has a measure of 30˚. Which equation could be used to determine the value of x? x + 30 = 180 x + 30 = 90 x = 90 + 130 x = 180 + 130 Two supplementary angles have measurements of (3x) ˚ and (10x – 15)˚. What are the measures of the two angles? 45˚ and 135˚ 15˚ and 165˚ 25˚ and 65˚ 30˚ and 60˚ Matching. Drag the different angle measurements given to the appropriate box. They will form complementary angles, supplementary angles, or neither. Complementary 70 and 20 1 and 89 8.5 and 81.5 Supplementary 125 and 55 100.25 and 79.75 47 and 133 Neither 30, 30, and 30 2 16 25 175 5 Solve! Use an equation to find the value of x, then find the measurement of each angle. Use numerical value only. 12 78 7 75