Equiangular quadrilaterals are four-sided polygons that have equal angles. These include squares (90 degree angles) and rectangles (90 degree angles).
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A rectangle.
square
rhombus
A square has four sides so it is a quadrilateral. All sides of a square are of equal length so it is equilateral. All angles of a square are of equal measure so it is equiangular. A quadrilateral that is equilateral and equiangular is a regular quadrilateral.
Yes! It's called a rhombus.