Question

A student solved the following problem and made an error.
In which line did the student make the first mistake?

Line 2

Line 5

Line 3

Line 4

Answer 1

Well he calculated AB and DE to be quite different, but then said they were of equal length?

Answer 2

@barrycarter Yeah I guess! I'm not really understanding it

Answer 3

Hmmm, the whole proof or just the mistake?

Answer 4

@barrycarter Just the mistake they made

Answer 5

Oh, in line 3 they say, AB = 2.83. In line 4, they say DE = 4.47. But, then in line 5, they say AB=DE, but 2.83 and 4.47 aren't equal

Answer 6

@barrycarter Ohhh, so it'd be like 2 or 3??