A mathematical diamond is a quadrilateral with four sides and four angles.
It simply depends of the length and proportions of the diamond. You have to know the sides of it to determine the angles. ;)
A rectangle is a quadrilateral with four sides. All angles are right angles, the diagonals are congruent, and the opposite sides are all equal. A rhombus (diamond) is a quadrilateral with congruent daigonals and equal angles.
Four sides and four angles.
Its a diamond :]
4 angles and 4 sides
4 sides and 4 angles
3 sides and 3 angles
10 sides and 10 angles