Similar Figures...

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

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

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

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

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