TRIG FORMULA COPIED! 📐
SINE RATIO
sin(θ) = O / H
COSINE RATIO
cos(θ) = A / H
TANGENT RATIO
tan(θ) = O / A
Trigonometry Variable Guide 📐
θ
Theta
The reference angle we are looking at. Usually measured in degrees.
O
Opposite Side
The side directly across from the angle θ. It doesn't touch the angle.
A
Adjacent Side
The side next to the angle θ that is not the hypotenuse.
H
Hypotenuse
The longest side, opposite the 90° angle. Always the same in a triangle.
sin
Sine Ratio
Calculated as Opposite divided by Hypotenuse (O/H).
cos
Cosine Ratio
Calculated as Adjacent divided by Hypotenuse (A/H).
tan
Tangent Ratio
Calculated as Opposite divided by Adjacent (O/A).
°
Degrees
The unit used to measure the rotation or size of the angle.
S-C-T
Mnemonic
The "magic word" to remember which sides go with which ratio.
sin⁻¹
Inverse Trig
Used to find the angle θ when you already know the side lengths.
=
The Ratio
The relationship between the angle and the sides remains constant.