Let's draw a rectangle around the triangle (as shown below) and then subtract from the rectangle's area (28) the areas of the 3 right triangles that surround the triangle in question.VJesus12 wrote:
In the rectangular coordinate system above, the area of triangular region PQR is
(A) 12.5
(B) 14
(C) 10√2
(D) 16
(E) 25
We get the following:
So, the area of PQR = 28 - (3.5 + 6 + 6) = 12.5
Answer: A
Cheers,
Brent
