Apply trigonometry to solve right-angled triangle problems (ACMMG224)
Solve right-angled triangle problems, including those involving angles-of-elevation-and-depression (ACMMG245)
Review the use of the trigonometric ratios to find the length of an unknown side or the size of an unknown angle in a right-angled triangle (ACMGM034)
Apply the cosine and sine ratios to find unknown angles and sides in right-angled triangles (ACMEM119)
Review sine, cosine and tangent as ratios of side lengths in right-angled triangles (ACMMM028)

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Standards

to see state-specific standards (only available in the US).

CCSSHSG-SRT.B.4

Prove theorems about triangles.

CCSSHSG-SRT.C.6

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.

CCSSHSG-SRT.C.7

Explain and use the relationship between the sine and cosine of complementary angles.

CCSSHSG-SRT.C.8

Use trigonometric ratios and the Pythagorean Theorem to solve right triangles in applied problems.

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