yes, every rhombus is a parallelogram.
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yes, I think of it as a diamond
yes, a rectangle is a parallelogram. A parallelogram is a polygon (closed shape with straight sides) that has exactly 2 pairs of parallel sides. A rectangle is a parallelogram with 4 right angles(90o). "Rectangle" is more specific. So all rectangles are parallelogram but not all parallelograms are rectangles.
No, a trapezoid is not a parallelogram.
If it is a parallelogram, then it has two sets of parallelogram sides. Parallelograms' opposite angles are congruent A parallelogram's bisectors are congruent. * * * * * A parallelogram's bisectors are NOT congruent.
A trapezoid is not a type of parallelogram. A parallelogram is a type of trapezoid.