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Similar Figures...

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have the same shape but not necessarily the same size example: Figure 1 Figure 2

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have corresponding parts ( sides, angles) Example: Side ac on fig. 1 corresponds to side hj on figure 2 Figure 1 h i a b c d j k

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Finding an unknown dimension Use ratios to help find an unknown length Example: Fig. 1 Fig. 2 3 in x 12 in 16 in

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Set up ratios using corresponding sides Figure 112 in 3 in Figure 216 in x Figure 112 in(÷ 4) 3 in Figure 216 in(÷ 4) x = 4 in

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OR... Figure 112 in 3 in Figure 216 in x in Figure 112 in(÷ 12) 1 (x 3) 3 in Figure 216 in(÷ 12)1.333333 (x3)x = 3.99999 = 4 inches

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7-4A Similar Figures and Proportions Learning Objective: To determine whether two given figures are similar, and to use similarity to find missing lengths.

7-4A Similar Figures and Proportions Learning Objective: To determine whether two given figures are similar, and to use similarity to find missing lengths.

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