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E and F are points on diagonal AC of a parallelogram ABCD such that AE = CF. Show that BFDE is a parallelogram.
Show that each angle of a rectangle is a right angle.
Two parallel lines l and m are intersected by a transversal p. Show that the quadrilateral formed by the bisectors of interior angles is a rectangle.
Show that the bisectors of angles of a parallelogram form a rectangle.
If the diagonals of a parallelogram are equal, then show that it is a rectangle.
Diagonals of a parallelogram ABCD intersect at O. If ∠BOC = 90º and ∠BDC = 50º, then ∠OAB is
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