AI generatedGeometry and measuresKS3 / GCSE

Finding a length scale factor

Finding a length scale factor.

  • Match corresponding lengths before taking a ratio.
  • Length scale factor gives area factor and volume factor .
  • Reverse with a square root or cube root when an area or volume ratio is given.

Example 1

Find the length scale factor from the smaller triangle to the larger.

Two triangles with equal corresponding angles, not to scaleEqual corresponding angles; not to scale
Large corresponding length ÷ small corresponding length.

Example 2

Find the length scale factor from the smaller triangle to the larger.

Two triangles with equal corresponding angles, not to scaleEqual corresponding angles; not to scale
Large corresponding length ÷ small corresponding length.

Your turn

Question 1

Find the length scale factor from the smaller triangle to the larger.

Two triangles with equal corresponding angles, not to scaleEqual corresponding angles; not to scale
Check answer
Large corresponding length ÷ small corresponding length.
Question 2

Find the length scale factor from the smaller triangle to the larger.

Two triangles with equal corresponding angles, not to scaleEqual corresponding angles; not to scale
Check answer
Large corresponding length ÷ small corresponding length.
Question 3

Find the length scale factor from the smaller triangle to the larger.

Two triangles with equal corresponding angles, not to scaleEqual corresponding angles; not to scale
Check answer
Large corresponding length ÷ small corresponding length.
Question 4

Find the length scale factor from the smaller triangle to the larger.

Two triangles with equal corresponding angles, not to scaleEqual corresponding angles; not to scale
Check answer
Large corresponding length ÷ small corresponding length.
Question 5

Find the length scale factor from the smaller triangle to the larger.

Two triangles with equal corresponding angles, not to scaleEqual corresponding angles; not to scale
Check answer
Large corresponding length ÷ small corresponding length.
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