<Li> a parallelogram with one right vertex angle and two adjacent equal sides </Li> <Li> a quadrilateral with four equal sides and four right angles </Li> <Li> a quadrilateral where the diagonals are equal and are the perpendicular bisectors of each other, i.e. a rhombus with equal diagonals </Li> <Li> a convex quadrilateral with successive sides a, b, c, d whose area is A = 1 2 (a 2 + c 2) = 1 2 (b 2 + d 2). (\ displaystyle A = (\ tfrac (1) (2)) (a ^ (2) + c ^ (2)) = (\ tfrac (1) (2)) (b ^ (2) + d ^ (2)).) </Li>

Write a formula for the area of a square in terms of its perimeter