This key facts covers Circle Vocabulary within Properties of Circles for GCSE Mathematics. Revise Properties of Circles in Geometry & Measures for GCSE Mathematics with 10 exam-style questions and 4 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 2 of 5 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 5
Practice
10 questions
Recall
4 flashcards
Circle Vocabulary
| Radius (r) | Distance from centre to edge |
| Diameter (d) | Distance across through centre (d = 2r) |
| Circumference | Distance around the outside (C = πd) |
| Chord | Line segment with both ends on the circle |
| Tangent | Line that touches circle at ONE point (90° to radius) |
| Arc | Part of the circumference |
| Sector | "Pizza slice" - area between two radii and an arc |
| Segment | Region between a chord and an arc |