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14 cards from this deck
Special relationships between sides and angles of right-angled triangles
Sine, cosine, and tangent
Longest side opposite the right angle
Side opposite to the angle being considered
Side next to the angle (not the hypotenuse)
sinA=oppositehypotenuse\sin A = \frac{\text{opposite}}{\text{hypotenuse}}sinA=hypotenuseopposite
cosA=adjacenthypotenuse\cos A = \frac{\text{adjacent}}{\text{hypotenuse}}cosA=hypotenuseadjacent
tanA=oppositeadjacent\tan A = \frac{\text{opposite}}{\text{adjacent}}tanA=adjacentopposite
SOH: Sine=Opp/Hyp, CAH: Cos=Adj/Hyp, TOA: Tan=Opp/Adj
sin2A+cos2A=1\sin^2 A + \cos^2 A = 1sin2A+cos2A=1 (always true for any angle)
Always, for any angle AAA
3-4-5 triangle (Pythagorean triple)
5-12-13 triangle (Pythagorean triple)
Always the longest side
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