Maths · KS3 Y9 · Geometry & Measures

Pythagoras: shorter sides

Pythagoras: shorter sidesFree12:24Heddy Score 3 of 7, below the standard
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What you need to know

  • Pythagoras’ theorem applies to right-angled triangles; the hypotenuse is opposite the right angle and is the longest side.
  • Use a² + b² = c², with c as the hypotenuse, then take a square root to find a missing side.
  • When the hypotenuse and one shorter side are known, subtract the shorter side’s square before taking the square root.

In this clip

Runs 12:24, from 0:00 to 12:24 of the full video.

Heddy Score3/7, Below the standard
See the seven stars
  • Trusted source · passed. The creator's own upload, live and playable here.
  • On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
  • Spec-true · not judged yet. Accurate, and right for the current UK specification.
  • Focused · passed. One idea, short enough to watch in one go.
  • Accessible · passed. Good captions, clear sound and pictures.
  • Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
  • Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
★ passed · ☆ pending · ✕ failed
Our students

Not enough students yet

Our own students' answers. These are what move ★7 Proven.
On YouTube

1.12M views · 14.3K likes · Math with Mr. J 2.03M subscribers

As reported by YouTube on 2026-11-01. Not part of the Heddy Score.
How the Heddy Score works

Why we picked it

The lesson identifies the sides and works through finding both the hypotenuse and a shorter side.

Math with Mr. J on YouTubechecked 2026-10-20

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