Scale & Ratios

Front

What is a scale drawing?

Back

A scale drawing is a representation of an object or space that is proportionally reduced or enlarged to fit on paper, using a specific ratio to maintain the correct dimensions.

Front

If a building is 300 ft tall and the scale is 1 inch : 10 ft, how tall is the building in the scale drawing?

Back

30 inches

Front

What does the term 'ratio' mean?

Back

A ratio is a comparison of two quantities, showing the relative size of one quantity to another, often expressed as 'a : b'.

Front

What is an equivalent ratio?

Back

An equivalent ratio is a ratio that expresses the same relationship between two quantities, even if the numbers are different.

Front

What is the scale factor?

Back

The scale factor is a number that scales, or multiplies, the dimensions of an object in a scale drawing, indicating how much larger or smaller the drawing is compared to the actual object.

Front

What happens to a figure when the scale factor is greater than one?

Back

The figure is enlarged.

Front

What happens to a figure when the scale factor is less than one?

Back

The figure is reduced.

Front

What is the scale factor if a shape is enlarged by a factor of 4?

Back

The scale factor is 4.

Front

What is the scale factor if a shape is reduced by a factor of 1/4?

Back

The scale factor is 1/4.

Front

How do you find an equivalent ratio for 3 : 5?

Back

Multiply both terms of the ratio by the same non-zero number, e.g., 3 x 2 : 5 x 2 = 6 : 10.