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Trapezoid ABCD is formed by

A (–7,3) B (–5,6) C (0,6), and D (0,3).Determine the length of the diagonal AC in trapezoid ABCD. Round to the nearest tenth and show all of your work.
what do I do?

2 answers

plot the points!
AD is parallel to BC, so the height is CD, which is ⊥ AD
Now area = (AB+BC)/2 * CD
No fancy distance formulas needed, since all the lines in question are either vertical or horizontal.
oops. I guess you do need the distance formula, which you have ...