|Specification References: G1.5h|
G1.5h Distinguish between centre, radius, chord, diameter, circumference, tangent, arc, sector and segment. Know and use circle theorems.
Questions asking for the angle at the centre of a regular polygon may be set.
When asked to give reasons for angles any clear indication that the correct theorem is being referred to is acceptable. For example, angles on the same chord (are equal), angle at centre is equal to twice angle at circumferene angle on diameter is 90o, opposite angle in cyclic quadrilateral add up to 180o. Alternate segment.
Questions assessing quality of written communication will be set that require clear and logical steps to be shown, with reasons given.