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8-1.4 Similar Triangles

# 8-1.4 Similar Triangles - 8.4 Similar triangles Pg 480...

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8.4 Similar triangles Pg 480

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Example In the diagram, LMN~ PQN a) write a statement of proportionality b) Find MN and QM 33 30 106 o 20 36 o LN PN MN QN LM PQ a = = ) b) MN=22 QM=42 L M N Q P
Postulate 25: AA ~ post (angle-angle similarity postulate) If two s of one are 2245 to two s of another then the two s are ~. ) )) ) )) A B C D E F If C 2245 F and A 2245 D, then ABC ~ DEF

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Explain why WVX~ WZY WVX 2245 ∠ WZY and ZWY 2245 ∠ VWX, so by AA~ post, WVX~ WZY. W V X Y Z
Slope Slope is the ratio of the change in y-values (vertical change) to the change in x-values (horizontal change) or x: y. Same as Therefore, choosing any 2 pts on a line will produce the same slope. run rise

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Example G(-3,4); H(-1,0); I(1,-4); J(2,-6) are all collinear. What is the slope of line GJ? -2
Ex: O(0,0) B(0,3) C(6,0) D(0,5)

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8-1.4 Similar Triangles - 8.4 Similar triangles Pg 480...

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