1. 7.1 Proportions Solving proportions
Solving problems with sides or angles in a given ratio.
2. A pentagon has angles in a ratio of 3:3:4:3:5. Find each angle measure. 1.
3. A rectangle has sides in a ratio of 3:4 and an area of Find the lengths of the sides.

2. 7.2: Similar Polygons Determine if two polygons are similar:
Write the similarity ratio.
Write a similarity statement.
Use proportions to find missing dimensions.
Corresponding angles are congruent.
Corresponding sides are proportional.
Ratio of corresponding sides in simplest form.
Quadrilateral ABCD ~ Quadrilateral DEFG.
Remember corresponding parts must match and vertices must go around the figure..

3. D C A B 8
y+3 4 12 T S R Q
x-2 6 10 9

4. 7.4 Triangle Proportionality TheoremsIf
then
> a b c d If
then
> a b c d If d c a b
>
then

5. 7.5: Proportional Relationships
Indirect measurements
Relationships between similarity ratio, ratio of perimeters and ratios of areas. 10 8
P=48
A=102