1. Find the size of each exterior angle of the following regular polygons.
   (c) decagon
   (b) octagon
   (a) heptagon
   2. Each interior angle of a regular polygon is 160°.
   (a) What is the size of each exterior angle?
   (b) How many sides does the polygon have?
   3. Calculate the number of sides of a regular polygon whose exterior angle is:
   (a) 15°
   (b) 36°
   (c) 45°
   (d) 18
   4. Find the number of sides of the regular polygons having the following
   interior angles:
   (a) 168°
   (b) 179°
   5. Calculate the number of sides of a regular polygon whose interior angle is
   three times the size of its exterior angle.
   6. For a regular polygon that has 15 sides calculate:
   (a) the size of the exterior angle
   (b) the size of the interior angle.
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