trigonometry finding lengths and angles

Trigonometry-Finding Lengths and Angles

By the end of this unit, students will be able to:understand and apply Pythagoras' Theorem to find missing lengths in right-angled triangles;use trigonometric ratios (sine,…
Target Age:

Lesson Overview

By the end of this unit, students will be able to:

  • understand and apply Pythagoras’ Theorem to find missing lengths in right-angled triangles;
  • use trigonometric ratios (sine, cosine, tangent) to find unknown angles and lengths in right-angled triangles;
  • apply these concepts to solve problems involving both 2D and 3D figures.

Curriculum Alignment: Key Stage 4: Geometry and Measures

  • apply Pythagoras’ Theorem and trigonometric ratios to find angles and lengths in right-angled triangles {and, where possible, general triangles} in 2 {and 3} dimensional figures
Last updated on: February 20, 2026

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