Similar ShapesQuestions about the scale factors of lengths, areas and volumes of similar shapes. 
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Level 1  Lengths of similar shapes
Level 2  Areas of similar shapes
Level 3  Volumes of similar shapes
Level 4  Mixed questions
Exam Style Questions  A collection of problems in the style of GCSE or IB/Alevel exam paper questions (worked solutions are available for Transum subscribers).
Similar Parts Puzzle  Use the colours to dissect the outlines into similar parts.
More on Enlargements including lesson Starters, visual aids, investigations and selfmarking exercises.
Square in Rectangle  An advanced lesson Starter.
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See the National Curriculum page for links to related online activities and resources.
If you enlarge the dimensions of a polygon by multiplying them by a number (scale factor), the area is increased by the square of that factor.
For example if the sides of a rectangle are enlarged by a factor of 6, the area of the rectangle increases by a factor of 6^{2}
If the length of the original rectangle was 5cm and the width was 2cm then after enlargement they would be 30cm and 12cm respectively.
The area of the original rectangle is 5cm x 2cm = 10cm^{2}
The area of the enlarged rectangle is 30cm x 12cm = 360cm^{2}
As you can see the area of the enlarged rectangle is 6^{2} times larger than the area of the original rectangle.
The same can be shown for any polygon when enlarged.
Enlargement by a fractional scale factor is equivalent to the shape reducing in size.
If you enlarge the dimensions of a three dimensional shape by a scale factor, the volume is increased by the cube of that factor.
For example if the sides of a cuboid are enlarged by a factor of 6, the volume of the cuboid increases by a factor of 6^{3}
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