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Re: If a triangle in the xy-coordinate system has vertices at [#permalink]
07 Jan 2019, 20:26

Expert's post

Carcass wrote:

If a triangle in the xy-coordinate system has vertices at (– 2, –3), (4, –3) and (28, 7), what is the area of the triangle?

A. 30

B. 36

C. 48

D. 60

E. 65

(-2,-3) and (4,-3) is a straight line parallel to x axis at y=-3. Therefore let's take this as the base..so Base = 4-(-2)=4+2=6..

Now the third vertice is (28,7).. If we are taking base as parallel to x-axis , the height will be parallel to y-axis. Therefore height is 7-(-3)=7+3=10