It is done out using a protractor.
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You are a rhombus.
If a circle (equalling 360 degrees) is cut into four pieces, then rearranged a bit, it will become to look like one quadrangle or another. That is why a quadrangle, no matter HOW messed up, will still equal 360 degrees when its angles are added up.
A quadrangle is a shape with 4 angles, such as a square, rectangle, or paralellogram. A four sided shape is called a quadrilateral.
A rhombus is a quadrilateral in which all of the sides are of equal length, It is an equilateral quadrangle. If any angle of an equilateral quadrangle is a right angle, then all its angles are right angles. It is also a square. All squares are rhombuses. Some rhombuses are squares. A rhombus is a parallelogram with 4 congruent sides. A square is a rhombus with 4 congruent angles.
Any parallelogram, including rhombus, but not including rectangle or square.