Right triangle trigonometry
A right triangle is defined as having
one angle precisely equal to 90o (a right
angle).
Trigonometric identities
H is the Hypotenuse, always being
opposite the right angle. Relative to angle x, O is the
Opposite and A is the Adjacent.
"Arc" functions such as "arcsin", "arccos",
and "arctan" are the complements of normal trigonometric
functions. These functions return an angle for a ratio
input. For example, if the tangent of 45o is
equal to 1, then the "arctangent" (arctan) of 1 is 45o.
"Arc" functions are useful for finding angles in a right
triangle if the side lengths are known.
The Pythagorean theorem
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