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GR.9.1

Find the hypotenuse in a right-angled triangle

Calculate the length of the hypotenuse in a right-angled triangle

6 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 - Pythagoras' Theorem And How To Use It (2026/27 exams)

Cognito 538K views

Clear UK GCSE walkthrough of using a squared plus b squared to find the hypotenuse.

Jump to 0:00Intro to Pythagoras' Theorem 0:17When Should You Use Pythagoras?1:00The Formula: a² + b² = c² 1:11Labelling the Sides 1:50Example 1: Calculating the Hypotenuse (Integer Sides)2:34Example 2: Calculating the Hypotenuse (Decimal Sides & Calculator)

Grade 3–6 Core 🇬🇧 UK

Pythagoras - Corbettmaths

corbettmaths 482K views

Trusted UK Corbettmaths tutorial covering Pythagoras and finding the hypotenuse.

Grade 3–6 Core 🇺🇸 US

Pythagorean Theorem: Finding the Length of the Hypotenuse | Math with Mr. J

Math with Mr. J 362K views

Friendly step-by-step guide to finding the hypotenuse with two clear worked examples.

Grade 3–6 Core 🇬🇧 UK

Finding the Hypotenuse in a Right-Angled Triangle

Jonathan Robinson 6K views

Straight-to-the-point UK lesson on calculating the hypotenuse with Pythagoras' theorem.

Grade 3–6 Core 🇬🇧 UK

Pythagoras' Theorem

Maths Genie 244K views

Comprehensive UK GCSE revision video on Pythagoras' theorem and the hypotenuse.

Grade 3–7 Core 🇺🇸 US

Pythagorean Theorem

The Organic Chemistry Tutor 818K views

Thorough tutorial finding the hypotenuse and other sides, with worked exam-style problems.