Topic explanation

Standard explanation

Equal chords subtend equal angles at the centre and cut off equal arcs.

Key points

• equal chords and equal central angles
• understand the idea
• apply it carefully
• keep the ideas separate
• Equal Chords And Equal Central Angles: Equal chords subtend equal angles at the centre and cut off equal arcs.
• WHAT — EQUAL CHORDS AND EQUAL CENTRAL ANGLES: Equal chords subtend equal angles at the centre and cut off equal arcs.
• HOW — Use the idea: Identify what is given, select this topic's rule or evidence, apply it one step at a time, and check
• CORE UNDERSTANDING: Equal chords subtend equal angles at the centre and cut off equal arcs.

Labelled diagram