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Byju's Answer
Standard IX
Mathematics
Surface Area of Hemisphere
The radius of...
Question
The radius of a solid hemisphere is
2
r
, then its total surface area will be :
A
12
π
r
2
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B
8
π
r
2
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C
6
π
r
2
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D
3
π
r
2
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Solution
The correct option is
C
12
π
r
2
Radius of solid hemisphere
=
2
r
Total surface area of hemisphere
=
2
π
r
2
+
π
r
2
=
3
π
r
2
=
3
π
×
(
2
r
)
2
=
12
π
r
2
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Q.
If two solid-hemisphere s of same base radius r are joined together along their bases , then curved surface area of this new solid is
(a)
4
πr
2
(b)
6
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(c)
3
πr
2
(d)
8
πr
2
Q.
How is the total surface area of a hemisphere , 3πr
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?
Q.
If the radius of a solid hemisphere is 5 cm, then find its curved surface area and total surface area. (
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Q.
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Q.
Question 15
If two solid hemispheres of same base radius r are joined together along their bases the curved surface area of this new solid is
(A)
4
π
r
2
(B)
6
π
r
2
(C)
3
π
r
2
(D)
8
π
r
2
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