Surface Area of Composite Shapes

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Composite Shapes

A composite shape is formed when we glue two or more shapes together.

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Surface area

  • When two 3D shapes are glued together to form a composite, the glued faces should not be included in the surface area.
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Surface area - example

  • If we glue two cubes of side length 3cm together along one face the total surface area is:
    • 10 × 9cm2 = 90cm2
  • Since there are 12 faces total, but two are not on the outside of the object.

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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