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Cosine Function: Cos(angle) = Adjacent / Hypotenuse
In a right triangle the cosine of an angle is the length of the adjacent side divided by the length of the hypotenuse.
Sine Function: Sin(angle) = Opposite / Hypotenuse
In any right triangle, the sine of an angle x is the length of the opposite side divided by the length of the hypotenuse.
Tangent Function: Tan(angle) = Opposite / Adjacent
In a right triangle, the tangent of an angle is the length of the opposite side divided by the length of the adjacent side.
The formula for Pythagorean Theorem: a2+b2=c2
"c" is the longest side of the triangle and "a" and "b" are the other two sides. If we know the lengths of two sides of a right angled triangle, we can find the length of the third side.
"Opposite" is opposite to the angle. No matter where the angle is on the right triangle is will always be opposite from it.
In a right triangle, a leg is either of the two sides that form the right angle. Not the Hypotenuse.