If the curved surface area of a sphere is 4nsq.m., then find the diameter of the sphere?
15. If the area of a sector of a circle of radius 2cm is n sq.m.then what is the central
angle
of
the
sector?
1
Answers
Answered by
9
Answer:
Given : Curved surface area of a sphere =1256 cm
2
We know that, Curved surface area of a spehre =4πr
2
⟹1256=4×3.14×r
2
⟹r
2
=
4×3.14
1256
⟹r
2
=100
∴r=10 cm
Hence, the answer is 10 cm.
Answered by
3
Answer:
Given, diameter d=14 cm
∴ radius =
2
d
=
2
14
=7 cm
Surface area of a sphere of radius 'r' =4πr
2
=4×
7
22
×7×7
=616cm
2
⇒ Here,area of a sector =πcm
2
⇒ r=2cm
⇒ Area of the sector =
360
o
θ
(πr
2
)
Where, θ is angle contained by sector.
πr
2
is area of a circle.
∴ π=
360
o
θ
×π×(2)
2
∴ θ=
4
360
o
=90
o
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