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ive seen this before. the teal and red triangles are not the same angle. the top triangle is actually a concave quadrilateral, and the bottom is convex. the teal triangle's slope is 1/3, where the bottom is 3/8
i found that extremely easy, but hard to explain.... the dimensions are the same, but if you have those two other shapes (not the triangles) where they originally were, it would be to tall and short. im not exactly sure how to explain it, but i can see it clearly