An 8x5 rectangle. If the bottom left corner is considered (0, 0), then two lines are drawn within the rectangle, from (0, 4) to (8, 1) and from (1, 5) to (7, 0). The smaller two regions of the four these lines cut the rectangle into are shaded. What is their combined area?
this was my approach
detailed annotation for screen readers here: 4 lines have been added to the original depiction. the first set of 2 lines make a triangle shape using coordinates (4, 2.5) to (4, 0) to (7, 0). the second set of 2 lines make a triangle shape using coordinates (4, 2.5) to (8, 2.5) to (8, 1)
spoiler
( (4x2.5)- (((2.5x3)/2)+((4x1.5)/2)) )x2 = 6.5That's what I did too