The french club sells bagels to 6th graders every Tuesday. There are 350 6th graders and they sell 50 bagels each Tuesday. Assuming 6th grade is representative, about how many bagels should they sell to the entire school of 750 students?

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B. congruent triangles

Step-by-step explanation:

Throughout the entire proof, we were mostly trying to show that ΔABD and ΔCDB are congruent so that we could prove that opposite sides of a parallelogram are equal.

Now we're down to the last step. This is where we need to show that the opposite sides are congruent. By definition of congruent triangles, corresponding sides are equal. Thus, since AD and BC are corresponding sides, they're equal.

The answer is B.