MA-331

Angles in polygons

Lower Sec Maths · Secondary 1 · Hard · Angles in polygons

The size of each interior angle of a regular polygon is 5 times the size of each exterior angle.

(a) What is the size of each exterior angle?

(b) How many sides does the polygon have?

Exterior angle is $30^\circ$ ; the polygon has 12 sides.
Exterior angle is $36^\circ$ ; the polygon has 10 sides.
Exterior angle is $25^\circ$ ; the polygon has 14 sides.
Exterior angle is $20^\circ$ ; the polygon has 9 sides.

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