Scale Factor

Front

What is a scale factor?

Back

A scale factor is a number that scales, or multiplies, some quantity. It is used to enlarge or reduce a figure.

Front

How do you calculate the perimeter of a scaled shape?

Back

To find the perimeter of a scaled shape, multiply the original perimeter by the scale factor.

Front

If a triangle has a perimeter of 12 cm and is enlarged by a scale factor of 3, what is the new perimeter?

Back

36 cm

Front

What does a scale of 1 inch = 42 miles mean?

Back

It means that every 1 inch on the map represents 42 actual miles.

Front

How do you find the height of a scaled drawing?

Back

Multiply the actual height by the scale factor to find the height in the drawing.

Front

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

Back

30 inches

Front

What is the area of a rectangle with dimensions 4 cm by 5 cm?

Back

20 cm²

Front

If a rectangle is enlarged by a scale factor of 3, how do you find the new area?

Back

Multiply the original area by the square of the scale factor (3² = 9). So, 20 cm² x 9 = 180 cm².

Front

What is the formula for the area of a rectangle?

Back

Area = length x width.

Front

If a model of a house is built using a scale of 5 in:25 ft, how do you find the actual size of a feature?

Back

Multiply the size in the model by the scale factor (5 in = 25 ft, so 1 in = 5 ft).