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A shape has three sides if its interior angles add up to equal 180 degrees.
It is an equilateral triangle that has 3 equal sides and 3 equal inside angles that add up to 180 degrees
Angles are measured in degrees, not sides.
A rhombus is a shape having two acute angles and four equal sides.
No shape has four equal sides and four different angles - either there are two pairs of equal angles, or all four angles are the same; or all sides are not the same length.