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mathematicsprinted 73 · PDF 74
165 pagesrevision 46935
printed 73 · PDF 74
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Tangent to a circle: The angle between the tangent to the circle and the radius is always 90°.
Both Line AB and AD are tangent to the circle and form 90° angles with the radius
Symmetry: There will be two types of questions that will be tested in your IGCSE
examinations: line of symmetry, and order of rotational symmetry
Line of symmetry: A line of symmetry divides a shape or an object into equal parts.
Examples can be seen in multiple geometric shapes such as a square or a kite etc. The kite
can only be divided into 2 equal parts. Therefore, It has 1 line of symmetry. On the other
hand, a square can be cut into 4 equal parts. Hence, it has 4 lines of symmetry.