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GR.8.3

Find missing lengths on similar shapes

Find missing lengths on similar shapes

4 hand-picked video lessons for this topic, each checked for relevance and clarity, graded by difficulty and labelled by depth. Press play to watch — nothing loads from YouTube until you do.

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Grade 3–6 Core 🇬🇧 UK

GCSE Maths - Similar Shapes (2026/27 exams)

Cognito 239K views

Crisp UK walkthrough of scale factor and finding missing sides on similar shapes.

Jump to 0:39Finding Unknown Side Lengths 1:00Example 1: Calculating the Scale Factor 1:40Example 1: Using the Scale Factor (Enlargement)2:06Example 2: Calculating Missing Lengths in Similar Triangles

Grade 3–6 Core 🇬🇧 UK

Using similar shapes to find a missing length

Maths Genie 126K views

Thorough Maths Genie run through many missing-length examples on similar shapes.

Grade 3–6 Core 🇬🇧 UK

Similar Shapes - GCSE Maths

1st Class Maths 68K views

Clear UK video covering missing lengths and angles with worked exam questions.

Jump to 1:55Example 1 2:42Example 2 3:57Example 3 5:24Example 4 7:22Exam Question 1

Grade 3–6 Core 🇬🇧 UK

Similar Shapes - Missing Sides

corbettmaths 130K views

Corbettmaths explains similar shapes and how to find missing sides step by step.