HW 6-1 Ratios and Proportions

Front

What is the formula for the perimeter of a rectangle?

Back

Perimeter = 2(length + width)

Front

If the ratio of length to width of a rectangle is 5:2, how can you express the length in terms of width?

Back

Length = (5/2) * Width

Front

What is the area of a rectangle?

Back

Area = length × width

Front

In a triangle with angles in the ratio 4:3:2, how do you find the measure of each angle?

Back

Let the angles be 4x, 3x, and 2x. Then, 4x + 3x + 2x = 180°; solve for x.

Front

What is a proportion?

Back

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

Front

What is a ratio?

Back

A ratio is a comparison of two quantities, expressed as a fraction or with a colon.

Front

How do you solve for x in a proportion?

Back

Cross-multiply and then solve for x.

Front

What is the relationship between similar triangles and ratios?

Back

In similar triangles, corresponding sides are in proportion.

Front

If two ratios are equivalent, what can be said about their cross products?

Back

The cross products are equal.

Front

What is the scale factor in similar figures?

Back

The scale factor is the ratio of the lengths of corresponding sides of two similar figures.