Similarity Test Review

Front

What is a proportion?

Back

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

Front

Back

To solve for x, cross-multiply: 4(x + 12) = 5(18). Then simplify and solve for x.

Front

What is the scale factor in dilation?

Back

The scale factor is a number that scales, or multiplies, the dimensions of a figure during dilation.

Front

How do you find the coordinates of a dilated point M' if M(3,2) and the scale factor is 2?

Back

Multiply each coordinate by the scale factor: M'(3*2, 2*2) = M'(6, 4).

Front

Back

Cross-multiply to find y: 4 * 42 = 6 * y, then solve for y.

Front

What does it mean to dilate a figure by a scale factor of 2?

Back

It means to enlarge the figure so that each point is twice as far from the center of dilation.

Front

Back

Cross-multiply: 3x * 20 = 5 * 15, then solve for x.

Front

What is the first step in solving a proportion?

Back

The first step is to cross-multiply the two ratios.

Front

Back

Cross-multiply: 48 * 20 = 4 * y, then solve for y.

Front

What is the result of dilating the point B(1,1) by a scale factor of 2?

Back

B'(1*2, 1*2) = B'(2, 2).