MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
If two shapes are similar, like we're told these pairs are, then the angles are congruent and corresponding side lengths are proportional. You can set up many different possible proportions- just make sure that you are putting corresponding parts in the same part of the fraction. For example, for a parallelogram, you could do big top/big bottom = small top/small bottom, or you could do big top/small top= big bottom/small bottom, or even the reciprocal of either of those. Solve by cross multiplying.
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