Maths · KS3 Y7 · Geometry & Measures

Parts of a circle

Parts of a circleFree5:00Heddy Score 3 of 7, below the standard
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What you need to know

  • The radius joins the centre to the circumference; all radii in a circle have equal length.
  • A chord joins two points on the circumference, and a diameter is a chord through the centre.
  • The diameter is twice the radius and divides the circle into two semicircles.

In this clip

Runs 5:00, from 0:05 to 5:05 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

367K views · 3.13K 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 defines and relates the centre, radius, chord and diameter with diagrams.

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

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