If the area of square ABCD is 36, what is the area of
∆ABC which lies inside square ABCD?
Point Q(2,5) lies on CD of square ABCD.
Point P(6,9) lies on BC on square ABCD.
Point A of ∆ABC coincides with point A of square ABCD.
I determined the area to be 21 but the text book tells me that the answer is 16.
What did I do wrong?
I hope this information is clearly stated here.