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Trigonometry basics

PROCEDURAL
MathematicsGeometry|Ages 13—15|ID: mt_KB_Czd7RQH

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 [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?”

Curriculum Standards1 alignment

KS3.Maths.Geo.14The national curriculum in England
Pythagoras' Theorem and Trigonometry

use Pythagoras' Theorem and trigonometric ratios in similar triangles to solve problems involving right-angled triangles

Mathematics · Key Stage 3

Prerequisites2

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