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A quadrilateral with four 90-degree angles?
A rectangle.
Why is a square always a rectangle but a rectangle is not always a square?
The definition of a rectangle is a quadrilateral with four 90 degree angles, which is not always a square. The definition of a square is a quadrilateral with four 90 degree angles and all sides congruent, which is always a rectangle.
What does a rectangle need to be a parallelogram?
All rectangles are also parallelograms. A parallelogram needs four 90-degree angles to be a rectangle
To make sure that a given parallelogram is a rectangle at least how many of its angles must measure 90?
You need only 1 90 degree angle.
Is length times width the formula for a rectangle?
it is the formula for both a rectangle and a square. remember a square is a rectangle, but a rectangle is not a square (what i mean is a square has to have all 90 degree angles and four sides that are all the same length a rectangle doesn't have all the same lengths. but a rectangle is a shape with all 90 degree angles, and a square fits that discription)
