7th Grade Scale Factor Unit 2b

Front

What is a scale drawing?

Back

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

Front

If a scale is 1 inch : 10 feet, how do you convert feet to inches?

Back

Multiply the number of feet by 0.1 to convert to inches.

Front

What does it mean for two figures to be similar?

Back

Two figures are similar if they have the same shape but different sizes, meaning their corresponding angles are equal and their sides are in proportion.

Front

How do you find the scale factor between two similar figures?

Back

Divide the length of a side of one figure by the corresponding side of the other figure.

Front

If a rectangle has a length of 20 inches and a width of 10 inches, what is the scale factor if the corresponding rectangle is 40 inches long?

Back

The scale factor is 2, since 40 inches / 20 inches = 2.

Front

What is the formula to find the area of a rectangle?

Back

Area = length × width.

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 is the difference between congruent and similar figures?

Back

Congruent figures are the same size and shape, while similar figures have the same shape but may be different sizes.

Front

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

Back

The corresponding sides would be 6 cm, 8 cm, and 10 cm.

Front

What is a scale factor?

Back

A scale factor is a number that scales, or multiplies, some quantity.