The side of a rhombus is 28 m and length of one of its diagonals is 12 m. The area of the rhombus is?	Choose the correct choice from the following options:
A) 326.2	B) 324.2	C) 328.2	D) 338.2	E) 328.9

Rationale: "area of the rhombus = 1 / 2 * p * √ 4 ( a ) 2 - ( p ) 2 a = 28 ; p = 12 a = 1 / 2 * 12 * √ 4 ( 28 ) 2 - ( 12 ) 2 = 1 / 2 * 12 * √ 3136 - 144 = 1 / 2 * 12 * √ 2992 a = 328.2 answer : c"
Answer: C