Surface Area of Cuboid and Cube
Exercise 7.2
1. Find the Total Surface Area and the
Lateral Surface Area of a cuboid whose dimensions are: length = 20 cm, breadth
= 15 cm and height = 8 cm
2. The dimensions of a cuboidal box are
6 m × 400 cm × 1.5 m. Find the cost of painting its entire
outer surface at the rate of ₹22 per m2.
3. The dimensions of a hall is 10 m
× 9 m × 8 m. Find the cost of white washing the walls and ceiling
at the rate of ₹8.50 per m2.
4. Find the TSA and LSA of the cube whose
side is (i) 8 m (ii) 21 cm (iii) 7.5 cm
5. If the total surface area of a cube
is 2400 cm2 then, find its lateral surface area.
6. A cubical container of side 6.5 m
is to be painted on the entire outer surface. Find the area to be painted and the
total cost of painting it at the rate of ₹24 per m2.
7. Three identical cubes of side 4 cm
are joined end to end. Find the total surface area and lateral surface area of the
new resulting cuboid.
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