# Solution - Surface Area of a Combination of Solids

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ConceptSurface Area of a Combination of Solids

#### Question

Find the surface area of a sphere of radius 4.2 cm. (π=22/7)

#### Solution

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In Fig. 5, from a cuboidal solid metallic block, of dimensions 15cm ✕ 10cm ✕ 5cm, a cylindrical hole of diameter 7 cm is drilled out. Find the surface area of the remaining block [Use

pi=22/7]

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A tent is in the shape of a cylinder surmounted by a conical top. If the height and diameter of the cylindrical part are 2.1 m and 4 m respectively, and the slant height of the top is 2.8 m, find the area of the canvas used for making the tent. Also, find the cost of the canvas of the tent at the rate of Rs 500 per m2. (Note that the base of the tent will not be covered with canvas.) [Use π = 22/7]

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Solution for concept: Surface Area of a Combination of Solids. For the course 9th - 10th SSC (English Medium)
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