In a scalene triangle, one side exceeds the other two sides by 4 cm and 5 cm respectively and the perimeter of the triangle is 36 cm . The aren of triangle is
  • A$63 cm^2$
  • B$9 \sqrt{10} cm^2$
  • C$18 \sqrt{10} cm^2$
  • D$12 \sqrt{21} cm^2$
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