Edexcel IGCSE Math A 4.2.D regular polygons

Practise regular-polygon questions by linking each exterior angle to 360 degrees and each interior angle to its supplement.

Exam points

Find the number of sides from an exterior angle by dividing 360 degrees.
Use interior and exterior angle relationships to form and solve equations.
Calculate n for a regular polygon when the angle information is given algebraically.

[Maximum number: 4]

Here are eight shapes drawn on a grid of squares.

Shape A is a polygon.

(a)

Explain what this tells you about shape B.

Two of the shapes have exactly 2 lines of symmetry.

[ 1 ]

(b)

the length of each side,
cm

[ 1 ]

(c)

the size of each angle.

[ 2 ]

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