The side of a rhombus is 20 m and length of one of its diagonals is 16 m. The area of the rhombus is?
Choose the correct choice from the following choices: A) 223.28 B) 293.28 C) 293.78 D) 291.28 E) 193.28

Rationale: "area of the rhombus = 1 / 2 * p * √ 4 ( a ) 2 - ( p ) 2 a = 20 ; p = 16 a = 1 / 2 * 16 * √ 4 ( 20 ) 2 - ( 16 ) 2 = 1 / 2 * 16 * √ 1600 - 256 = 1 / 2 * 16 * √ 1344 a = 293.28 answer : b"
Answer: B