Circle is round
A circle has no corners and no straight sides. It is fully round. Wheels, the sun, a clock face — all circles!
Square has 4 equal sides
A square has 4 corners and 4 sides that are all the same length. Like a chess board square or a window pane.
Triangle has 3 sides
A triangle has exactly 3 sides and 3 corners. A slice of pizza or a road sign is a triangle.
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