Is every rectangle also a square?

Answer 1

Yes all squares meet the requirements of a rectangle. They are equiangular quadrilaterals (have 4 equal angles) and have two pairs of opposite parallel sides. Squares are a subset of all equilateral rectangles. Thus, all squares are rectangles, but only some rectangles are squares.
Yes all squares are rectangles because they have four equal angles and two pairs of opposite parallel sides. Not all rectangles are squares however, because only some of them are equilateral.

Answer 2

No, only some rectangles are squares. For a rectangle to be a square, all sides must be equal (the rectangle must be equilateral). Only the equilateral rectangles are squares, but every square is a rectangle.

In short, the squares are a subset of rectangles in which all four sides are equal in length. Some rectangles are squares, and all squares are rectangles.

Answer 3

A rhombus is another name for a geometric square.

Answer 4

Yes. All squares are rectangles.