A rectangle has four corners, each of which is 90 degrees. 4 * 90 degrees = 360 degrees
If it weren't 90 degrees it wouldn't be a rectangle. Are you sure you worded this the way you meant?
A rectangle, by definition, has four angles, each of 90 degrees.
Both a square and a rectangle have 4 angles of 90 degrees.
A square and a rectangle
All angles of a rectangle are 90 degrees.
90+90+90+90
90 degrees
A right angle - whether or not in a rectangle - is 90 degrees.
Each angle of a rectangle measures 90 degrees.
The corner of a square or rectangle is 90 degrees.
Its beacause that's how all rectangles are if is not at or higher than 90 degress than its a rectangle To construct 90 degrees in the centre of a rectangle, connect the midpoints of each set of parallel lines. You will then have a cross in the centre that is perpendicular to each other (90 degrees).