CAIE IGCSE Mathematics Core Circle and Solid Terms

Practise recognising and drawing circle features and identifying common plane shapes or simple-solid parts with exact geometrical vocabulary.

Exam points

name radius, diameter, chord or tangent by how the line meets the centre or circumference
use diameter = 2 × radius and mark the centre when drawing a circle from a diameter
distinguish a solid's face or curved surface from an edge and name common shapes accurately

[Maximum number: 1]

The diagram shows a circle, centre O, radius 11 cm. C, F, G and H are points on the circumference of the circle.
The line AD touches the circle at C and is parallel to the line EG. B is a point on AD and angle $A B O=140^{\circ}$ .

Write down the mathematical name of the straight line AD.

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C4.1.1 3 Use and interpret the vocabulary of a circle question 1