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Geometry Basics

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Vertices and edges

  • The corners of a polygon are called vertices and the sides are called edges.
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  • A plane is a flat 2 dimensional surface like the surface of a table.
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Parallel lines

  • If two lines are parallel they point in exactly the same direction and will never meet.
  • Parallel lines are indicated by drawing matching arrows on the lines.
  • If there are two different pairs of parallel lines then different arrows are used for each pair.
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Perpendicular lines

  • Two lines are perpendicular if the angle between them is a right angle (90°).

Jump to other topics


1.1Place Value

1.2Factors & Multiples


1.4Fractions, Decimals & Percentages

1.5Growth & Decay

1.6Measurements & Units



3Ratio, Proportion & Rates of Change

4Geometry & Measures



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