Grade 11 • Formula Set 5
Trigonometry essentials: SOHCAHTOA, unit circle coordinates, transformations, period formulas, and solving trig equations.
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Why it matters
- SOHCAHTOA helps you link angles to side ratios instantly.
- The unit circle gives exact trig values without guessing.
- Transformations let you shift and stretch sine/cosine/tangent graphs.
- Period formulas tell how fast a trig wave repeats.
- Solving trig equations shows up in Algebra 2, precalc, and beyond.
- These are core tools for modeling waves, motion, and cycles.
Tip: Start with the unit circle — it makes everything else easier.
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01 — SOHCAHTOA Mnemonic