Mathematics Geometry Procedural 13–15 yrs

Trigonometry basics

三角函数基础

Description

Use the trigonometric ratios sin, cos, and tan in right-angled triangles to find unknown sides and angles, including setting up the correct ratio for a given problem

Mastery Evidence

✓ Identify which trigonometric ratio to use (SOH CAH TOA) based on the known and unknown sides
✓ Calculate an unknown side using sin, cos, or tan and a known angle
✓ Find an unknown angle using the inverse trigonometric function (e.g. tan⁻¹)

Assessment Prompt

If your child knows a ladder is 5 metres long and leans against a wall at 70° to the ground, can they use trigonometry to work out how high up the wall it reaches?