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Lesson Worksheet: Surface Areas of Composite Solids Mathematics • 7th Grade
In this worksheet, we will practice finding the surface area of a composite solid using the formulas for lateral or total surface areas of a single solid.
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.
Liam 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.