Can a rectangle have a right angle? Asked by Dexter Bonilla A rectangle is a quadrilateral in which all angles are right angles. A rectangle is a parallelogram, so its opposite sides are equal. The diagonals of a rectangle are equal and bisect each other. Michaela Harris, BA Contributor 4.4/523 ratings Rate this answer Leave your comment You may be interested inIn a rectangle how many angles are right angles? a quadrilateral with four right angles.How many right angled triangles are in a rectangle? Explanation: Rectangle has 4 right angles.How many right angles does a rectangle have? A rectangle has opposite sides which are equal and parallel. It also has four right angles.