rectangle
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
A diamond, typically referring to the shape of a rhombus or a geometric figure with four equal sides, has four angles. The sum of the interior angles in any quadrilateral, including a diamond shape, is 360 degrees. In a diamond shape, opposite angles are equal, and adjacent angles are supplementary (adding up to 180 degrees).
Angles are measured in degrees, not sides.
A square
rectangle
A shape has three sides if its interior angles add up to equal 180 degrees.
Any regular shaped polygon has equal angles and equal sides
A shape with 3 sides is exactly triangular as for example an equilateral triangle has 3 equal sides and 3 equal angles of 60 degrees that add up to 180 degrees.
It is an equilateral triangle that has 3 equal sides and 3 equal inside angles that add up to 180 degrees
If all 4 sides are equal and the angles are not 90 degrees it is a rhombus.
Anything that has 4 equal sides and 4 equal interior angles of 90 degrees
A parallelogram
a square. all of the angles are 90 degrees or pi/2 radians.
A shape with 4 right angles and 4 equal sides is a square. ==========================
A square has 4 equal sides with opposite angles that are equal.