8th Grade Ratios and Proportions Review Flashcard

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division, often expressed as 'a to b' or a:b.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

What does scale factor mean in geometry?

Back

A scale factor is a number that scales, or multiplies, some quantity. In geometry, it is used to enlarge or reduce figures.

Front

What is the difference between congruent and similar figures?

Back

Congruent figures have the same shape and size, while similar figures have the same shape but not necessarily the same size.

Front

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

Back

The scale factor is found by dividing the length of a side of one figure by the corresponding side of the other figure.

Front

What is dilation in geometry?

Back

Dilation is a transformation that produces a figure similar to the original by proportionately enlarging or reducing it.

Front

If point A is (4,8) and the scale factor is 3, what are the coordinates of A'?

Back

A' (12, 24)

Front

What does it mean for angles to be congruent?

Back

Congruent angles have the same measure.

Front

Back

False.

Front

What is the formula for finding the area of similar figures?

Back

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