PreTest Unit 4a: Similar Figures

Front

What is a scale factor?

Back

A scale factor is a number that scales, or multiplies, some quantity. In geometry, it is the ratio of the dimensions of a scaled figure to the dimensions of the original figure.

Front

If a scale factor is greater than 1, what happens to the size of the figure?

Back

The figure gets bigger.

Front

What does a scale factor of 1 mean?

Back

A scale factor of 1 means that the figure remains the same size; it does not change.

Front

What is the scale from the actual object to a drawing if 1 inch represents 5 feet?

Back

The scale is 1 inch to 5 feet.

Front

How do you find the actual distance if the scale is 6mm to 2cm?

Back

To find the actual distance, convert the scale to the same units and use the ratio to calculate the actual size.

Front

What are the side lengths of a rectangle that is 2 inches by 3 inches scaled by a factor of 7?

Back

The side lengths of the scaled copy are 14 inches and 21 inches.

Front

In a scale drawing, if 1 inch represents 10 feet, how do you convert inches to feet?

Back

Multiply the number of inches by the scale factor (10) to find the actual feet.

Front

What is the actual width of Colin's room if it is 1.25 inches wide in the drawing with a scale factor of 10?

Back

The actual width is 12.5 feet.

Front

What is the actual length of Colin's room if it is 1.5 inches long in the drawing with a scale factor of 10?

Back

The actual length is 15 feet.

Front

If a rectangle is scaled down by a factor of 1/2, what happens to its dimensions?

Back

The dimensions of the rectangle are halved.