Trigonometry (SOHCAHTOA)

Use SOHCAHTOA to find angles and sides in right-angled triangles — the backbone of trig at GCSE.

Exact Trigonometric Values

Learn the exact values of sin, cos, and tan for 0°, 30°, 45°, 60°, and 90° — no calculator needed.

Finding Angles with Trigonometry

Use inverse trig functions (sin⁻¹, cos⁻¹, tan⁻¹) to calculate unknown angles in right-angled triangles.

SOHCAHTOA — Introduction

Meet SOHCAHTOA: the three trig ratios for right-angled triangles and how to set them up correctly.