What is the area of a quadrilateral with a height of 7, if one side has length 10?
(1) One of the diagonals divides the quadrilateral into two symmetric identical triangles.
(2) The perimeter of the quadrilateral is 42.
(1) One of the diagonals divides the quadrilateral into two symmetric identical triangles.
(2) The perimeter of the quadrilateral is 42.