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the whole shape isnt actually a triangle.. first one is a concav and the second one is a convex quadrangle.. the convex one has a bigger area, so that it has a room for another square..
if you put a ruler against your screen, you will see the hypotenus of the big triangle is not a straight line.. so it has an extra corner there...
if you dont understand it, dont worry about it... its kinda late for you to learn geometry then..
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