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GT Geometry 3/2/11 Turn in CW/HW from yesterday by the time the bell rings. Pick up a ditto and complete 1-6.

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Presentation on theme: "GT Geometry 3/2/11 Turn in CW/HW from yesterday by the time the bell rings. Pick up a ditto and complete 1-6."— Presentation transcript:

1 GT Geometry 3/2/11 Turn in CW/HW from yesterday by the time the bell rings. Pick up a ditto and complete 1-6

2 #3.16 Geo. Drill 3/2/11 Given that the following two pentagons are similar, find x. x

3 Geometry Drill Can you list the 5 ways to prove triangles congruent

4 Objective Students will use the AA, SAS and SSS similarity postulates to decide which triangles are similar and find unknowns.

5 Congruence vs. Similarity Congruence implies that all angles and sides have equal measure whereas...

6 Congruence vs. Similarity Similarity implies that only the angles are of equal measure and the sides are proportional

7 AA Similarity Postulate Two triangles are similar if two pairs of corresponding angles are congruent

8 AA Similarity Postulate A B C D E F

9 SAS Similarity Postulate Two triangles are similar if two pairs of corresponding sides are proportional and the included angles are congruent

10 SAS Similarity Postulate A B C D E F

11 SSS Similarity Postulate Two triangles are similar if all three pairs of corresponding sides are proportional.

12 SSS Similarity Postulate A B C D E F

13 Example 1 APE ~ DOG. If the perimeter of APE is 12 and the perimeter of DOG is 15 and OG=6, find the PE.

14 Conclusion Congruence vs. Similarity AA SAS SSS

15 Classwork/Homework Page skip 10, 11.


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