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Area Contradictions

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i remember seeing this ages ago when i was very young, and it has come back to haunt me. can anyone tell me whats going on here?????? http://www.optillusions.com/dp/1-44.htm using the sides the area of the top one is 1/2*13*5 or 1/2*65 therefore the bottom one is 1/2*65 - 1 , but working out the areas of the individual shapes and adding them up yields the mean of both the above areas (32). what!! (anyone know where i can find some more of these?)

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Look at the slope of the red triangle. Look at the slope of the green triangle.

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