MathDB
Three lines and area formed by it.. "classic"

Source:

November 21, 2005
geometry

Problem Statement

The area of the triangle bounded by the lines y=x,y=xy = x, y = -x and y=6y = 6 is
(A)  12(B)  122(C)  24(D)  242(E)  36 \mathbf{(A)}\; 12\qquad \mathbf{(B)}\; 12\sqrt2\qquad \mathbf{(C)}\; 24\qquad \mathbf{(D)}\; 24\sqrt2\qquad \mathbf{(E)}\; 36