1. Regular Geometry Shapes
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2. Regular Pentagon Draw a pentagon inside the circle.
From A drop down a straight line to the centre of the circle.
Construct point B by measuring 72° from line A.
A to B is equal to the length of one side
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3. Regular Pentagon Set the compass to length AB.
From A mark the position of E.
Mark off point D from E.
Mark off point C from B.
Drawing the pentagon in this manner reduces the margin of error.
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4. Regular Hexagon
Example 2 given the length of one side AB = 40mm draw a hexagon
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5. Example 3 given the length of one side AB = 35mm draw a hexagon
Do not use protractor
Hexagon 6 sides and 6 angles are equal
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6. Drawing a Hexagon given side
Hexagon consist of six equilateral triangles
Complete triangle to find centre
Draw circle from centre touching both corners
Complete hexagon
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7. Drawing an Octagon inside a square
Octagon 8 sides and 8 angles are equal
Draw a Square side 120mm
Join the diagonals
From corner set compass to centre and strike the two adjacent sides
Join the arcs at each corner to draw in all eight sides
45º
J.Byrne 2017