Scale Factor and Scale Figures Review

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 scale drawing to the actual object.

Front

If a scale drawing of a car is 3 cm long and the scale is 1 cm:4 ft, what is the actual length of the car?

Back

12 feet

Front

What does it mean for two figures to be similar?

Back

Two figures are similar if they have the same shape but not necessarily the same size, meaning their corresponding angles are equal and their corresponding sides are in proportion.

Front

How do you find the missing side length in similar triangles?

Back

Use the ratio of the lengths of corresponding sides to set up a proportion and solve for the missing length.

Front

Which of the following figures is a scaled copy of figure A?

Back

Figure D

Front

What is the relationship between scale factor and area?

Back

The area of similar figures is proportional to the square of the scale factor.

Front

If the scale factor is 4, what does that mean for the dimensions of the figure?

Back

It means that each dimension of the figure is 4 times larger than the corresponding dimension of the original figure.

Front

What is the scale drawing of a figure?

Back

A scale drawing is a representation of an object that is proportional to the actual size of the object, using a specific scale.

Front

If a triangle has sides of lengths 3, 4, and 5, what are the lengths of the sides of a similar triangle with a scale factor of 2?

Back

6, 8, and 10.

Front

How do you determine if two figures are scaled copies of each other?

Back

Check if their corresponding angles are equal and their corresponding sides are in proportion.