Asked by madelyn

△ABC has verticles A(1,1), B(1,7), and C(6,5).
What is the area of △ABC?
A. 12 units
B. 15 units
C. 20 units
D. 14 units
Answered by oobleck
If you let AB be the base, then it is easy to see that the altitude is 5.
1/2 (6)(5) = 15
Answered by henry2,
A = 1/2(h*b) = 1/2(7-1)(6-1) = 15 units.
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