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Right angle

Algebra Sin, Cos, and Tan

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Algebra
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Geometry
Triangles
Elementary mathematics
Trigonometry
Elementary geometry
Triangle geometry
Right triangle
Hypotenuse
Triangle
Sine
Right angle
Adjacent
A right-angled triangle is a triangle in which one of the angles is a right-angle. The hypotenuse of a right angled triangle is the longest side, which is the one opposite the right angle. The adjacent side is the side which is between the angle in question and the right angle. The opposite side is opposite the angle in question. In any right angled triangle, for any angle: The sine of the angle = the length of the opposite side the length of the hypotenuse The cosine of the angle = the length of the adjacent side the length of the hypotenuse The tangent of the angle = the length of the opposite side the length of the adjacent side So in shorthand notation:
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