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Understanding scale factors and geometric ratios

Ratio, proportion and rates • Ratio and proportion

Key concepts

What you'll likely be quizzed about

  • A scale factor is a multiplier used to determine the proportion between two similar geometric figures.
  • It defines how much a figure is enlarged or reduced.
  • For instance, if a triangle's scale factor is 2, each side length of the triangle in the scaled version is twice that of its original.
  • This measurement is essential when comparing sizes without altering the shape's integrity.

Flashcards

Test your knowledge with interactive flashcards

What is the scale factor if a rectangle's length doubles?

Click to reveal answer

The scale factor is 2 if the rectangle's length doubles while the width retains its proportion.

Key notes

Important points to keep in mind

Scale factors maintain shape proportions.

Similar figures have equal angles.

Calculate scale factor by side length ratios.

Use scale factors in real-world applications.

Double-check corresponding sides for accuracy.

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