Kindergarten Grade Common Core: G.SRT.9
Common Core Identifier: G.SRT.9 / Grade: K
Curriculum: Similarity, Right Triangles, And Trigonometry: Apply Trigonometry To General Triangles
Detail: (+) 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.
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