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In this lesson, we will learn how to find the surface area of a composite solid using the formula of lateral or total surface area for a single solid.

Q1:

The buoy below is made of two right circular cones on a common base of radius 27 cm. If the cost of an erosion resistant coat is 300 LE per square metre, find, to the nearest tenth, the cost of painting the buoy.

Q2:

The buoy below is made of two right circular cones on a common base of radius 48 cm. If the cost of an erosion resistant coat is 300 LE per square metre, find, to the nearest tenth, the cost of painting the buoy.

Q3:

Sherif cut a right-triangular prism from the center of a cylinder that had a radius of 6 cm and a height of 20 cm as illustrated. Calculate, to 2 decimal places, the surface area of the resulting shape.

Q4:

Work out the surface area of the prism.

Q5:

The object shown is made from two cubes, one of side 3.3 cm, and the other 1.2 cm. If you must paint this object, what area do you report?

Q6:

The object shown is made from two cubes, one of side 5.8 cm, and the other 2.5 cm. If you must paint this object, what area do you report?

Q7:

The object shown is made from two cubes, one of side 6.4 cm, and the other 3.1 cm. If you must paint this object, what area do you report?

Q8:

This shape is composed of a rectangular prism and a right square pyramid. Calculate the surface area of the shape. If necessary, round your answer to 2 decimal places.

Q9:

This model is formed of a pyramid on top of a prism, and its total height is 22 inches. Which has a greater surface area, the prism or the pyramid?

Q10:

The given figure is made by placing a cube of side length 13 cm on the top of another cube of side length 18 cm. Find its surface area.

Q11:

This shape is composed of a cylinder and a hemisphere. Find the surface area of the shape leaving your answer in terms of π .

Q12:

A room has a floor in the shape of a square of side 5 m. Its walls are 3 m high, and it has door that is 87 cm wide and 2.1 m high. It also has two windows, each 90 cm by 51 cm. What is the cost of painting the walls and ceiling at a cost of 11 LE per square metre? Give your answer to the nearest hundredth.

Q13:

A room has a floor in the shape of a square of side 3 m. Its walls are 3.2 m high, and it has door that is 93 cm wide and 2.1 m high. It also has two windows, each 90 cm by 59 cm. What is the cost of painting the walls and ceiling at a cost of 8 LE per square metre? Give your answer to the nearest hundredth.

Q14:

If a part of a cube, whose edge length is 7 cm, is cut to form a cuboid with side lengths of 3 cm, 4 cm, and 4 cm, find the surface area of the remaining part of the cube.

Q15:

If a part of a cube, whose edge length is 17 cm, is cut to form a cuboid with side lengths of 7 cm, 8 cm, and 11 cm, find the surface area of the remaining part of the cube.

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