The sides of a triangle are in the ratio 2 : 3 : 4. The perimeter of the triangle is 18 cm. The area (in sq.cm) of the triangle is
A9
B36
C
D
A9
B36
C
D
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A hollow iron cylinder of inner radius 15 cm its outer radius is 16 cm and height of the cylindr is 63cm how much iron is required to construct the hollow circular cylinder?