Friday, October 23, 2015

Math problem of the week: one more Common Core-inspired geometry proof

I. One of only two problems involving an actual proof in the 18 sample problems in PARCC's practice geometry test (the proof part of the problem, Part B, is highlighted below):





(For the other proof problem in this test, see last week's post.)


Extra Credit: 

In how many steps can this proof be completed?

Does practice constructing lengthy proofs play any role in preparing for college and career in the 21st century?

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