Right Triangle Trigonometry
Use sine, cosine, and tangent to solve right triangle problems.
Practice Problems
opposite=3, hypotenuse=5
30-60-90 triangle, short leg = 4
Pro Tips & Shortcuts
SAT Tip: Memorize SOH-CAH-TOA - it's essential for SAT trig problems.
SAT Tip: Memorize this ratio to solve 45-45-90 triangles instantly.
SAT Tip: The hypotenuse is always twice the short leg in a 30-60-90 triangle.
SAT Tip: Always identify which sides you have before choosing the ratio.
SAT Tip: Multiply the short leg by √3 for long leg, by 2 for hypotenuse.
Opposite is across from the angle, adjacent is next to it, hypotenuse is longest side.
If you see a 45° angle in a right triangle, the other acute angle is also 45°.
Short leg is opposite 30°, long leg is opposite 60°, hypotenuse is opposite 90°.
If you have opposite and hypotenuse, use sine.
The ratio 1:√3:2 scales with the short leg.