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In Fig. 6.7, the square and the rhombus are not similar because  
Atheir corresponding sides are not proportional
Bthey have unequal numbers of sides
Ctheir corresponding sides are proportional, but corresponding angles are not equal
Done figure is larger than the other
Answer & Solution
Correct answer: C. their corresponding sides are proportional, but corresponding angles are not equal
Both figures have all sides equal, so corresponding sides can be taken in the same ratio. However, a square has all angles $90^\circ$, while a rhombus need not have right angles. Since corresponding angles are not equal, they are not similar.
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