RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 21. Surface Area and Volume of a Sphere

Subject: Mathematics - Class 9th

Q. No. 3 of Exercise 21.1

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3

Find the total surface area of a hemisphere and a solid hemisphere each of radius 10 cm. (Use π = 3.14)

We have,


Radius = 10 cm


Total surface area of a hemisphere = 2πr2


Total surface area of a hemisphere = 2 × 3.14 × 10 × 10 = 628 cm2


Total surface area of a solid hemisphere = 3πr2


Total surface area of a solid hemisphere = 3 × 3.14 × 10 × 10 = 942 cm2


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