Trigonometry Basics Practice
Quantitative Skills · Advanced Tools
New numbers every set.
Choose one skill for 8 questions, or Mixed review for 12. Every set has new numbers.
No timer. Use scratch paper and a calculator in degree mode. The rules from the lesson are below.
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Reference
Right triangle rules
- The hypotenuse is across from the 90° angle. It is the longest side, and it never changes.
- Mark θ first. The opposite side is across from θ, and the adjacent side is the leg next to θ. If you change the angle, they swap.
- Memory aid: SOH CAH TOA (Sine = Opposite/Hypotenuse, Cosine = Adjacent/Hypotenuse, Tangent = Opposite/Adjacent)
- sin θ = opposite/hypotenuse, cos θ = adjacent/hypotenuse, tan θ = opposite/adjacent.
- Finding a side: label the side you know and the side you want, pick the ratio that uses both, then solve. A leg is always shorter than the hypotenuse.
- Finding an angle: use sin⁻¹, cos⁻¹ or tan⁻¹ (2nd, then SIN, COS or TAN). The −1 means undo, not 1 over.
- Use degree mode. Check it: sin(30) should give 0.5. If you get −0.988, the calculator is in radian mode.
Practice for the Trigonometry Basics lesson in Quantitative Skills. Original ZornScience questions.
About this activity
Name the sides of a right triangle, use SOH CAH TOA, and find missing sides and angles in degree mode. Every set has new numbers, and each answer gets feedback right away.
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