A semicircular sheet of paper of
diameter 4ram is bent into a
open conical cup. Find the
depth & volume of the cup.
LD Radius of sector = slant height of come
Cength of are of sector = circumference
of base of love
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Answer:
ANSWER
REF.Image.
→ surface area of sheet =
2
πr
2
=
2
1
×
7
22
(7)
2
=77cm
2
⇒2r=2πr
1
⇒r
1
=
π
r
=
And surface area of cone =πrl
⇒π(
π
r
)l=77⇒l=
r
77
=11
as l
2
=h
2
+r
12
=h
2
=11
1
−
π
2
r
2
volume =
3
1
πr
12
h=
3
π
×
π
2
r
2
(121−
π
2
r
2
)
=
3π
7
2
(121−
π
2
7
2
)
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