Midcontinent Research for Education and Learning
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Common Core Mathematics 912
Cluster
Apply trigonometry to general triangles
Grade 912
G.SRT.9.
(+) Derive the formula A = 1/2 ab sin(C) for the area of a triangle by drawing an auxiliary line from a vertex perpendicular to the opposite side.
G.SRT.10.
(+) Prove the Laws of Sines and Cosines and use them to solve problems.
G.SRT.11.
(+) Understand and apply the Law of Sines and the Law of Cosines to find unknown measurements in right and nonright triangles (e.g., surveying problems, resultant forces).