Cambridge International Mathematics

4 Assumed Knowledge (Geometry and graphs)

Apolygonis any closed figure with straight line sides which can be drawn on a flat surface.

is a polygon. are not polygons.

Atriangleis a polygon with 3 sides.

Aquadrilateralis a polygon with 4 sides.

Apentagonis a polygon with 5 sides.

Ahexagonis a polygon with 6 sides.

Anoctagonis a polygon with 8 sides.

TRIANGLES

There are several types of triangle you should be familiar with:

scalene right angled isosceles equilateral

REGULAR POLYGONS

Aregular polygonis one in which all sides are equal and all angles are equal.

For example, these are all regular polygons:

equilateral triangle square regular hexagon

C POLYGONS [4.1]

Three sides of

different lengths.

One angle a

right angle.

Two sides

are equal.

Three sides

are equal.

60° 60°

60°

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