height
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If you draw a diagonal in a rectangle you get two equal triangles, each half the area of the rectangle. Area of rectangle is base x height, so half of that is ½ x base x height. QED
Area = (base) x (height)= (5y - 3) x (11)= 55y - 33
lxb (length x base)
Rectangle: length x width triangle: (base x height)/2
This is the exact same answer as the area of a 10in x 24in rectangle. Essentially, you are multiplying the base and height of a rectangle to get its area, too.