2. 1.The base of a closed triangular prism has sides 13,14 and15 centimeters
long. And its height is 20 centimetres.What its surface area ?
3. 2. A solid triangular prism with equilateral base is 5 centimeters high and its
base perimeter is 12 centimetres.Find its surface area ?
4. ACTIVITY 2
1. The base of a triangular prism has sides 13,14 and 165centimeters long and
its height is 2 centimetres.What is its volume ?
5. 2. The base of a prism is an equilateral triangle of perimeter 15 centimeters and
its height is 5Centimeters. What is its volume?
6. 3. A water tank in shape of a prism has isocelestrapeziums as bases whose
dimentions are shown below.
The lenghth of the tank is 80 centimetres.How many litres of water
can it contain?
75cm
50cm
40cm
7. 4. In the school ground, there is a pit in the shape of a regular hexagon, to collect rain
-water.
Each side of the pit is 2 meters long and the pit is 3 meters deep. It contains water
1metrehigh.How many liters is it?
8. ACTIVITY 3
1.A block of wood in the shape of squares prism has the sides of its base
10centimetres long and it is20metres high. What is the volume of the largest cylinder
that can be carved out from it?
9. 2.A solid metal cylinder of base radius 15 centimetres and height
32 centimetres Is melteddown and recast into a cylinder of base radius
20centimetres.What is the height of the cylinder?
10. 3.Two rectangular sheets, each of sides 10 centimeters and 6 centimeters are
rolled to form cylinders ,one along the longer edge and the other along the
shorter edge, to make two cylindrical cans.Which has the larger capacity?
11. 4. The base radii of two cylinders of the same height are in the ratio
3:4.What is the ratio of their volumes?
