Use side ratios in right triangles to define trigonometric ratios.
M3.G.SRT.C.4.A
Understand that by similarity, side ratios in right triangles are properties of the angles in the triangle, leading to definitions of trigonometric ratios for acute angles.
M3.G.SRT.C.4.B
Explain and use the relationship between the sine and cosine of complementary angles.
M3.MP3
Construct viable arguments and critique the reasoning of others.
M3.MP5
Use appropriate tools strategically.
M3.MP6
Attend to precision.
M3.MP7
Look for and make use of structure.
M3.MP8
Look for and express regularity in repeated reasoning.
