A = 1 over 2 1 2 (5.5 + 9.5)(11)

A = 1 over 2 1 2 (5.5 + 9.5)(13)

A = 1 over 2 1 2 (11 + 13)(9.5)

A = 1 over 2 1 2 (9.5)(15)

A = 1 over 2 1 2 (9.5)(15.6)

A = 1 over 2 1 2 (9.5)(11)