Rahul's younger brother is playing with his lego set. He put a cuboidal block of height 5.18 cm, then he placed a a cubical block over it of height 95 mm and a conical block of height 57 mm. What is the height of the tower created by his brother
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Class 10
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>>A cubical block of side 7 c...
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A cubical block of side 7 cm is surmounted by a hemisphere. What is the greatest diameter the hemisphere can have? Find the surface area of the solid.
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Solution
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As per the question we can draw the diagram,
The diagram shows that the greatest diameter possible for such hemisphere is equal to the length of cube edge, i.e., 7cm.
Radius (r) of hemispherical part =
2
7
=3.5cm
Total surface area of solid = Surface area of remaining cubical part + CSA of hemispherical part + Area of base of hemispherical part
=6(Edge)
2
+2πr
2
−πr
2
=6(Edge)
2
+πr
2
=6(7)
2
+
7
22
×
2
7
×
2
7
=294+38.5
=332.5 cm²
Answer:
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Step-by-step explanation:
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