5.1 and 5.7 Ratios & Proportions with Similar Figures.notebook
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November 30, 2015
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5.1 Ratios and Proportions w ith Similar Figures
I CAN...Set up and solve proportions with similar figures.
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A proportion is used to compare two ratios or make equivalent fractions.
A ratio is a comparison between two values. Such as the following:
1 apple: 3 oranges
This ratio compares apples to oranges. It means for every apple there are 3 oranges.
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Jane has a box of apples and oranges in the ratio of 2:3. If she has six apples, how many oranges does she have?
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Solving Proportions
Cross Multiply
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Try these!
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In February, 1993, the exchange rate of Canadian dollars to American dollars was 1 to 0.79. You paid 30 Canadian dollars for a sweater. What was the price of the sweater in American dollars?
Now try this!
5.1 and 5.7 Ratios & Proportions with Similar Figures.notebook
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November 30, 2015
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Similar Polygons: Two polygons are similar if their corresponding angles are congruent and the lengths of their corresponding sides are proportional.
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Ex 1: Solve for x
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The quadrilaterals are similar.
Solve for x and y.
5.1 and 5.7 Ratios & Proportions with Similar Figures.notebook
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November 30, 2015
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Are these similar triangles? How can you tell?
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The Triangle Proportionality Theorem states that a line parallel to one side of a triangle divides the other two sides proportionally.
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G
Example 1: Determine if line CD is parallel to line BG
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Example 2:
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Example 3: Find the value of x and the length of GH
G
H
J
K
L
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Example 4: Find the value of x
5.1 and 5.7 Ratios & Proportions with Similar Figures.notebook
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November 30, 2015
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Example 5: Find the value of x
24x
610
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