Sine, Cosine & Tangent
Grade 8 · Right Triangle Trigonometry · Core Concepts
sin(θ)
OppositeHypotenuse
= O/H
cos(θ)
AdjacentHypotenuse
= A/H
tan(θ)
OppositeAdjacent
= O/A = sin/cos
| θ | sin θ | cos θ | tan θ |
|---|---|---|---|
| 0° | 0 | 1 | 0 |
| 30° | 1/2 | √3/2 | 1/√3 |
| 45° | √2/2 | √2/2 | 1 |
| 60° | √3/2 | 1/2 | √3 |
| 90° | 1 | 0 | undefined |
⚡ Memory Keys
SOH → sin = Opp/Hyp
CAH → cos = Adj/Hyp
TOA → tan = Opp/Adj
SOHCAHTOA
Pythagorean: a²+b²=c²
sin²+cos²=1
tan=sin÷cos
Practice Problems