G.35.b
Use similarity to explore and define basic trigonometric ratios, including sine ratio, cosine ratio, and tangent ratio.
Khan Academy ResourcesUse ratios in right trianglesRelate ratios in right trianglesTrig values of special anglesTrig values of π/6, π/4, and π/3Trig identities from reflections and rotationsSine & cosine of complementary anglesTrig values of π/4Cosine, sine and tangent of π/6 and π/3Using complementary anglesTrig word problem: complementary angles

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