Homework Unit 4a: Similar Figures

Front

What is a scale factor?

Back

A scale factor is a number that scales, or multiplies, some quantity. It is used to determine the ratio of the dimensions of a model or drawing to the actual object.

Front

If a scale factor is less than 1, what happens to the figure?

Back

The figure gets smaller.

Front

What does a scale of 1 inch to 10 feet mean?

Back

It means that every 1 inch on the drawing represents 10 feet in real life.

Front

How do you calculate the actual distance using a scale?

Back

Multiply the measurement on the drawing by the scale factor.

Front

What is the actual distance across a coin if the scale is 6mm to 2cm and the photo shows 9.75mm?

Back

9.75 mm.

Front

What is the scale factor if 3 cm on a map represents 150 yards in real life?

Back

The scale factor is 50.

Front

How do you find the scale factor from a drawing to the actual size?

Back

Divide the actual size by the size in the drawing.

Front

If Colin's drawing has a width of 1.25 inches and a scale factor of 10, what is the actual width?

Back

12.5 feet.

Front

What is the relationship between similar figures and scale factors?

Back

Similar figures have the same shape but different sizes, and their corresponding sides are proportional, which is defined by the scale factor.

Front

What happens to the dimensions of a figure if the scale factor is 2?

Back

The dimensions of the figure double.