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A parallelogram
a trapezoid :) * * * * * Not necessarily. A trapezoid can have two right angles, one acute and one obtuse angle. A parallelogram which is not a rectangle must have 2 acute and 2 obtuse angles.
No there isn't
A rhombus is a geometric shape, a diamond is not. 'Diamond' is from decks of cards, 'Rhombus' is from Math. BTW, a rhombus is a parallelogram* with opposite acute** and obtuse*** angles and all four sides are the same length.*opposite sides of the shape are parallel** less than 90∘***more than 90∘
An iscoceles triangle that is either obtuse or acute