A square and a rectangle both have 4 right angle corners.
A tetrahedron (a pyramid with a triangular base).
A rectangle.
Any rectangle (including squares).
Yes
A square has no acute angles but it does have 4 right angle corners.
square
Vertices are A shape with 4 corners many of this corners has a letter next to each of the four corners. Ex.) Name the vertices of a square, You would name the letters on the four corners.plural of vertex and the corner of a shape for instance a cube it has 8 vertexes!
rectangle
A square or quadrilateral.
A triagular based pyramid has 4 corners, 6 edges and 4 faces
a square a right angle is the L shape at the four corners of the square