The diagram shows squares 1, 2, and 3 constructed on the sides of a right triangle. . . which statement about the squares must be true? . a.(perimeter of 1) + (perimeter of 2) = (perimeter of 3). b.(area of 1) + (area of 2) = (perimeter of 3). c.(area of 1) + (area of 2) = (area of 3). d.(perimeter of 1) + (perimeter of 2) = (area of 3).