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Geometry Revision

Angles, shapes, area & volume — part of Maths on KODO.

AQA Edexcel OCR WJEC SQA

Geometry is a core area of KS3 Maths in the national curriculum. It covers essential concepts that build the foundation for GCSE study and beyond.

This topic includes subtopics such as Angles on a straight line, Angles in a triangle, Area (rectangle), Area (triangle) and more. Each area is tested with multiple-choice questions that include detailed explanations to deepen your understanding.

Quick Reference

Rectangle arealength × width
Circle areaπ × r²
Angles in a triangleAlways add to 180°
Cuboid volumelength × width × height

Key Definitions

Perimeter
The total distance around the outside of a 2D shape.
Area
The amount of space inside a 2D shape, measured in square units (cm², m²).
Volume
The amount of space inside a 3D shape, measured in cubic units (cm³, m³).
Parallel lines
Lines that are always the same distance apart and never meet.
Perpendicular
Two lines that meet at a right angle (90°).

What You'll Cover

Angles on a straight line
Angles in a triangle
Area (rectangle)
Area (triangle)
Perimeter
Angles (parallel lines)
Volume (cuboid)
Area (circle)
Pythagoras
Angles around a point
Angles in a quadrilateral
Volume (prism)
Angles (triangles, parallel lines)
Area and perimeter
Transformations (rotation, reflection, translation)
Volume
Pythagoras' theorem

Test Yourself — Geometry

Try 3 quick questions. No account needed.

Quick Quiz

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Memory Tricks & Mnemonics

"Area of a triangle = ½ × base × height" — "Half a rectangle"

Visualise the triangle as half of the rectangle it fits inside.

"Angles in a triangle add to 180°, in a quadrilateral 360°"

Use these facts to find missing angles.

"SOH CAH TOA" — Sin = Opposite/Hypotenuse, Cos = Adjacent/Hypotenuse, Tan = Opposite/Adjacent

Trigonometry ratios for right-angled triangles (higher tier).

Frequently Asked Questions

What is Perimeter in Maths?+
The total distance around the outside of a 2D shape.
What is Area in Maths?+
The amount of space inside a 2D shape, measured in square units (cm², m²).
What is Volume in Maths?+
The amount of space inside a 3D shape, measured in cubic units (cm³, m³).
What is Parallel lines in Maths?+
Lines that are always the same distance apart and never meet.
What does Geometry cover in KS3 Maths?+
Geometry in KS3 Maths covers Angles on a straight line, Angles in a triangle, Area (rectangle), Area (triangle), Perimeter, Angles (parallel lines), Volume (cuboid), Area (circle). Angles, shapes, area & volume.
What is the best way to revise Geometry?+
Test yourself rather than re-reading notes. Do a short Geometry quiz, read the explanation for every answer you get wrong, then come back to those questions a few days later. KODO does this automatically with spaced repetition, and you can turn any topic into printable flash cards.
Is Geometry revision on KODO free?+
Yes. KODO is free for everyone until Friday 18 December 2026, with unlimited quizzes on Geometry and every other topic. After that there is still a free plan with daily quizzes.

Start practising Geometry now

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More Maths Topics

AlgebraNumberStatistics

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