SME
Grade 7 Math
Supplementary, complementary, vertical and adjacent angles
The main lesson, then each kind of problem it solves.
Supplementary, complementary, vertical and adjacent angles
Main lesson
Complementary angles
Use this for “Two angles make a right angle. One is 35°. What is the other?”
Vertical angles
Use this for “Two lines cross. One angle is 50°. Find the other three.”
Unknown angles with an equation
Use this for “Two supplementary angles: one is twice the other. Find both.”
Angles in a triangle
Use this for “A triangle has angles of 54° and 71°. What is the third?” or “An exterior angle is 125° and one far angle is 54°. Find the other far angle.”
Parallel lines and a transversal
Use this for “Lines ℓ and m are parallel. Angle 1 is 50°. Which angles are 50° and which are 130°?”
Which kind of angle pair?
Use this for “Are these angles complementary, supplementary or vertical?”
Can the sides make a triangle?
Use this for “Can sticks of 2, 3 and 6 inches make a triangle?”