Fundamentals of Math

Fundamentals of Mathematics

similar, then you can use the meaning of proportions to assist in finding the measurement of an unknown side. Just remember, you must match corresponding sides together.

Example 5.5

To find the missing side length, set up a proportion. Note: You could have set-up the proportion in a number of combinations (hypotenuse over hypotenuse equals leg over leg or done the opposite hypotenuse over leg) – the order doesn’t matter as long as you are consistent.

=

Next, substitute in the known and unknown values and solve for the missing length.

44 55

? 40

55(? ) 55

1760 55

=

⟹ 55(? ) = 1760 ⟹

=

⟹ ? = 32

The missing side length is 32.

Practice 5.5

Directions: Find the missing side length (indicated by a ?) in each polygon.

1.

2.

3.

4.

5.

Answer Key on Page 123

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