Maths · KS3 Y7 · Geometry & Measures

Perimeter & area

Perimeter & areaFree7:56Heddy Score 3 of 7, below the standard
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What you need to know

  • Find missing side lengths by using the total lengths of the parallel sides, then add the outside edges to calculate perimeter.
  • Split an L-shaped composite figure into rectangles, calculate each rectangle’s area and add the results.

In this clip

Runs 7:56, from 0:04 to 8:00 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

850K views · 9.82K likes · Math with Mr. J 2.03M subscribers

As reported by YouTube on 2026-11-02. Not part of the Heddy Score.
How the Heddy Score works

Why we picked it

It gives a worked method for finding perimeter and area of a composite shape.

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

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