Shelf brackets, cheese wedges, door stops, folded napkins
Because is a triangle in which one angle is a right angle or a 90-degree angle.
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A bike seatPyramid
a triangle a triangle
with the three sides you know it will be a triangle, it is a right triangle, it is not an equilateral triangle or an isosceles triangle... so it must be a right scalene triangle
Triangles, pyramids, and prisms can all have triangular shapes.
A right angle triangle