Clusters should not be sorted from Major to Supporting and then taught in that order. To do so would strip the coherence of the mathematical ideas and miss the opportunity to enhance the major work of the grade with the supporting clusters.

Assessed with:
MAFS.912.GSRT.3.8
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Formative Assessments
Lesson Plans
MFAS Formative Assessments
Students are asked to explain the relationship between sine and cosine of complementary angles.
Students are asked to use 306090 triangle relationships to observe and explain the relationship between sin 30 and cos 60 (or sin 60 and cos 30).
Students are given the sine and cosine of angle measures and asked to identify the sine and cosine of their complements.
Students are asked to explain the relationship between sine and cosine of the acute angles of a right triangle.