Looking at the dark green triangle and then the red triangle, the green one is 5 squares long x 2 squares high...the red is 3 squares high (1.5 times the height of the green on) THEREFORE the length should be 1.5 times 5 which is 7.5 but the red triangle is 8 squares long which makes it a slightly different shape to the green on which also means that neither of the mixed block shapes are triangles but quadrilaterals.

 

Does that make sense?

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so, put simply, the left hand angle of the red and green triangles (the most acute angles in each) aren't equal, so in the first picture, the hypotenuse is slightly concave, and in the second it's slightly convex

 

I had to print them out and hold a ruler agains the edges of the triangles to suss this one out

OR you can just make the shapes out of paper of card and test it yourself.

yeh

so

problem solved ey

groovy