In the figure given below, the shaded portion is covered with cement. If the area of unshaded triangle is \[300\text{ }{{\text{m}}^{2}}\], then what area is covered with cement?

• A. \[600\text{ }{{\text{m}}^{2}}\]              
• B.         \[400\text{ }{{\text{m}}^{2}}\]
• C. \[450\text{ }{{\text{m}}^{2}}\]              
• D.         \[300\text{ }{{\text{m}}^{2}}\]
• E. None of these