IA2.GR.B.5: Use similarity of right triangles to explain and define trigonometric ratios (sine, cosine, and tangent) for acute angles as properties of the angles, based on side ratios.

Use similarity of right triangles to explain and define trigonometric ratios (sine, cosine, and tangent) for acute angles as properties of the angles, based on side ratios.

Example Problems

Find the exact value:

\sin{60°}

Find the exact value:

\cos(90°)

Find the exact value:

\cos(210°)

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