Scale factor
Flashcard
•
Mathematics
•
7th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is a scale factor?
Back
A scale factor is a number that scales, or multiplies, some quantity. It is used to enlarge or reduce dimensions in geometric figures.
2.
FLASHCARD QUESTION
Front
How do you calculate the perimeter of a rectangle?
Back
Perimeter = 2 * (length + width).
3.
FLASHCARD QUESTION
Front
If a rectangle has dimensions 3.5 in. x 5 in. and is enlarged by a scale factor of 2.5, what are the new dimensions?
Back
New dimensions = (3.5 in. * 2.5) x (5 in. * 2.5) = 8.75 in. x 12.5 in.
4.
FLASHCARD QUESTION
Front
What is the formula for the area of a rectangle?
Back
Area = length * width.
5.
FLASHCARD QUESTION
Front
If a rectangle has an area of 20 cm² and is enlarged by a scale factor of 3, what is the new area?
Back
New area = original area * (scale factor)² = 20 cm² * 3² = 180 cm².
6.
FLASHCARD QUESTION
Front
How do you find the scale of a drawing?
Back
Scale = actual length / drawing length.
7.
FLASHCARD QUESTION
Front
If a model of a flagpole has a scale of 1 in. = 4 ft, how tall is a model that measures 12 inches?
Back
Actual height = model height * scale factor = 12 in. * 4 ft/in. = 48 ft.
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