Scale factor
Calculate scale factor in Grade 9 math — Explanation The scale factor is your secret resizing code! Part of Linear Equations and Proportions for Grade 9.
Key Concepts
Property A scale factor is the ratio of a side length of a figure to the side length of a similar figure.
Examples If a small triangle has a side of length 6 and its similar, larger version has a corresponding side of length 18, the scale factor from small to large is $\frac{18}{6} = 3$. A model car is 5 inches long, while the real car is 15 feet (180 inches) long. The scale factor of the model to the real car is $\frac{5}{180} = \frac{1}{36}$.
Explanation The scale factor is your secret resizing code! It’s the single number you multiply by to get from one similar figure to another. If you're enlarging a shape, the factor is greater than 1. If you're shrinking it, the factor is less than 1. It’s the ultimate copy and resize tool for perfect proportions!
Common Questions
What is 'Scale factor' in Grade 9 math?
Explanation The scale factor is your secret resizing code! It’s the single number you multiply by to get from one similar figure to another.
How do you solve problems involving 'Scale factor'?
It’s the single number you multiply by to get from one similar figure to another. If you're enlarging a shape, the factor is greater than 1.
Why is 'Scale factor' an important Grade 9 math skill?
Always remember to put the new shape's measurement on top and the original shape's measurement on the bottom.. A good way to check is to ask yourself: 'Is the shape getting bigger or smaller?' If it's getting bigger, your scale factor should be greater than 1.