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Is a parallelogram sometimes a square?
It can be if it is a 3d cube
Are parallelogram and a trapezoid sometimes always or never similar to each other?
Never. In a trapezoid, the shape is like a triangle with the tip cut off. A parallelogram has two sets of parallel sides, rather like a crooked cube.
What is the cross sectional area of a cube with a perimeter of 48cm?
A perimeter is normally defined for 2-dimensional shapes and not three dimensional ones. A cube has 12 edges. So, if the perimeter is 48 cm, each edge must be 48/12 = 4 cm. The cross section of a cube depends on the angle of the plane intersecting the cube and, if it is not perpendicular to the cube, can be triangular, parallelogram or hexagonal. Assuming the plane is at right angles to the cube, the cross section is a square with sides of 4 cm. So its area is 16 cm2
Is a parallelogram a trapazoid?
No, a parallelogram is not a trapezoid.
Is a square or trapezoid have a special name and is a parallelogram?
Square = parallelogram and a square trapezoid = trapezoid Parallelogram = Parallelogram
