Take note that a triangle is a polygon with three sides. While, a rectangle is a polygon with 4 sides and 4 angles that measure 90 degrees. One example that has a top view of a triangle and a side and front view that are each rectangles is a box of a chocolate toblerone. You can refer on the image below.

You may come to your mind that a roof is one example, however, be careful about that because the top view of a roof is not a triangle. You can refer on the image that I included below.

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