Madison and Brandons Unit 3 Day 3 Blog(Trigonometry)

Unit 3, Day 3: Objective: Sine, Cosine, Tangent and their inverses continued Sin/Cos of complementary angles.

Define: Complementary angles means that the angles sum up to 90 degrees (which makes sense because we know all three angles inside a triangle sum to 180).

sin A = cos (90 - A)

cos A = sin (90 - A)

      In this picture angle A plus angle B equal 90 degrees; angle A and angle B are complementary.

 In this picture the <rx minus the <ry equals the ry angle. They are complementary angles.

Quiz:

Answer Key: