Trigonometric Ratio: Cotangent
How to solve cotangent (trigonometric ratio) problems: definition, example, and its solution.
Cotangent is the reciprocal of tangent.
[tan A = (Opposite side) / (Adjacent)]
So cot A = (Adjacent) / (Opposite side).
cot A = (adjacent side) / (opposite side)
In the given right triangle,
the adjacent side is missing.
So find the adjacent side
by using the Pythagorean theorem.
(adjacent side) = √21
cot A = 1 / tan A
So tan A = 2/√21.
So, its reciprocal, cotangent is
cot A = √21/2.