Basically, angular points of a rectangle refer to the vertices in itself. They are so - called because at the vertices, an angle is formed. Any other point on the line is simply called a 'point' but the point where an angle is formed is called as 'Angular point'.
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In Cartesian co-ordinates, the points (0,0), (4,0), (4,4) and (0,4) are an example of the four vertices of a rectangle.
Angular measurement between two line, when one of them is surface line and another is the line which connect a point on the surface to the peak of the object is known as angular elevation of that object with reference to the the perticular on the surface.
Join the mid points of a pair of opposite sides of a rectangle. Rotate the rectangle using this line as the axis for rotation, and it will mark out a cylinder..
Coplanar means "on the same plane". A plane can be a figure or shape like a rectangle. Coplanar points means points that belong on the same plane.
'Angular' , as in ' the angular corner'.