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# 7 3 Similar Polygons

## on Jan 14, 2009

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## 7 3 Similar PolygonsPresentation Transcript

• Ratio, Proportion, and Similarity 7-3 Similar Polygons
• Similar Polygons
• Two polygons are similar if their vertices can be paired so that:
• Corresponding angles are congruent
• Corresponding sides are in proportion
• If these triangles are similar, what is AB?
• 6
• 8
• 10
• 12
• 14
A C B E F D 12 30 21 ? 20 14 0 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
• If the corresponding angles of two polygons are congruent, must the polygons be similar?
• Yes
• No
25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
• If the corresponding sides of two polygons are in proportion, must the polygons be similar?
• Yes
• No
0 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
• Two polygons are similar. Do they have to be congruent?
• Yes
• No
9 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
• Two polygons are congruent. Do they have to be similar?
• Yes
• No
0 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
• Are all regular pentagons similar?
• Yes
• No
0 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
• SPICSA
• Page 250 2-22 even