What are the three components of the Formula Triangle?

In basic triangle trigonometry, we look at three trigonometric functions: sine, cosine and tangent (sin, cos and tan) with right triangles.

Trigonometry formulas triangles

Let us start by naming the parts of this triangle.

θ is one of the angles of the right triangle (but not the right angle!)

h is the hypotenuse - the longest side of the right triangle

o is opposite to the angle

a is adjacent to the angle

The three formulas to rememeber can be summed up in one acronym:

SOH CAH TOA

where s stands for sine, c for cosine and t for tangent.

The three formulas are written below:

Explanation:

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