Topics
28. Circle Geometry
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iGCSE (2021 Edition)

28.01 Chords and arcs

Lesson
Worksheet
Practice

Interactive practice questions

Solve for $x$x.

Show all working and reasoning.

Easy
1min

Solve for $x$x.

Easy
< 1min

In the diagram, $O$O is the centre of the circle. Solve for $x$x.

Easy
1min

In the diagram, $O$O is the centre of the circle. Solve for $x$x.

Easy
< 1min
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Outcomes

0580C4.7E

Calculate unknown angles using the property of an angle in a semicircle.

0580E4.6

Recognise rotational and line symmetry (including order of rotational symmetry) in two dimensions. Recognise symmetry properties of the prism (including cylinder) and the pyramid (including cone). Use the following symmetry properties of circles: • equal chords are equidistant from the centre • the perpendicular bisector of a chord passes through the centre • tangents from an external point are equal in length.

0580E4.7E

Calculate unknown angles using the property of an angle in a semicircle.

0580E4.7H

Calculate unknown angles using the following geometrical properties: • angle at the centre of a circle is twice the angle at the circumference. • angles in the same segment are equal.

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