7th Grade: Scale Drawing & Scale Factor Flashcard

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

What is a scale factor?

Back

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

Front

If the scale factor is 1:2, what does it mean?

Back

It means that every 1 unit in the drawing represents 2 units in the actual object.

Front

What does reduction mean in scale drawings?

Back

Reduction means that the scale drawing is smaller than the actual object, indicated by a scale factor less than 1.

Front

What does enlargement mean in scale drawings?

Back

Enlargement means that the scale drawing is larger than the actual object, indicated by a scale factor greater than 1.

Front

How do you find the actual length of an object from a scale drawing?

Back

Multiply the length in the scale drawing by the scale factor.

Front

If a tree in a scale drawing is 2 inches tall and the scale is 1 inch:5 feet, what is the actual height of the tree?

Back

10 feet (2 inches x 5 feet/inch = 10 feet).

Front

What is the formula to find the missing side in similar figures?

Back

The formula is: (length in drawing)/(length in actual) = (missing side in drawing)/(missing side in actual).

Front

If a model is built to a scale of 1:20 and the model is 4 feet long, how long is the actual object?

Back

80 feet (4 feet x 20 = 80 feet).

Front

What is the purpose of using scale drawings?

Back

Scale drawings are used to represent large objects in a manageable size, making it easier to visualize and understand their dimensions.