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### Mathematical Skills | Mensuration

 Q. No. 7: If the perimeter of an isosceles right triangle is (6+3√2)m, then the area of the triangle is A : 4.5 m2 B : 5.4 m2 C : 9 m2 D : 3.2 m2 Solution
 Q. No. 8: The area of the base of a right equilateral triangular prism is 9√3 cubic cm. If the height of prism is 16cm, find its whole surface area. A : 288+18√3 B : 288+3√3 C : 180+√3 D : None of these Solution
 Q. No. 9: The area of four walls of a room is 120 sq m and the length twice the breadth. If the height of the room is 4m, then find the area of the floor. A : 48 sq m B : 49 sq m C : 50 sq m D : 52 sq m Solution
 Q. No. 10: A metal cube of edge 12cm is melted and formed into three smaller cubes. If the edges of two smaller cubes are 6cm and 8cm, find the edge of the third smaller cube. A : 10 cm B : 14 cm C : 12 cm D : 16 cm Solution
 Q. No. 11: A well has to dug out that is to be 22.5m deep and the diameter 7m. Find the cost of plastering the inner curved surface at Rs 3 per sq meter. A : Rs 1465 B : Rs 1485 C : Rs 1475 D : Rs 1495 Solution
 Q. No. 12: Water flows out through a circular pipe whose internal diameter is 2cm. at the rate of 6m/s into a cylindrical tank, the radius of whose base is 60 cm. By how much will the level of water rise in 30 minutes? A : 2 m B : 3 m C : 4 m D : 5 m Solution
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