What shape has all sides congruent and all angles congruent?

A square or an Isoceles triangle NOT An acute triangle.also a diamond

ANS2:Any polygon can be drawn with all sides and angles equal. That sort of triangle is called an equilateral triangle and that sort of quadrilateral is called a square. Polygons with more sides are described as "regular" e.g., a stop sign is a regular octagon. Please see the link to understand why an equilateral octagon is not necessarily the same as a regular octagon.