Q2W8 Geo Ratios, Proportions, Scale Factor Flashcard

Front

What is a ratio?

Back

Front

What is a proportion?

Back

Front

How do you solve for a variable in a proportion?

Back

Cross-multiply the ratios and solve the resulting equation.

Front

What is scale factor?

Back

Scale factor is a number that scales, or multiplies, some quantity. In similar figures, it is the ratio of corresponding lengths.

Front

If two figures are similar, what can be said about their corresponding angles?

Back

The corresponding angles of similar figures are equal.

Front

If two figures are similar with a scale factor of 3, what is the ratio of their areas?

Back

The ratio of their areas is the square of the scale factor, which is 3^2 = 9.

Front

What is the formula for finding the missing side in similar triangles?

Back

Front

How do you find the missing length in a proportion?

Back

Set up the proportion and cross-multiply to find the missing length.

Front

What does it mean for two ratios to be equivalent?

Back

Two ratios are equivalent if they represent the same relationship between quantities.

Front

What is the relationship between scale factor and dimensions of similar figures?

Back

The dimensions of similar figures are proportional to the scale factor.