the total surface area for iron pipe which is 28 cm long if its thickness of the pipe is 1 cm and an outer diameter is 13 cm (Jo Koi bhi ise karega mai usee ipad or laptop dungi free apna address bhej dena)
Answers
Answer:
14 cm
Step-by-step explanation:
the total surface area for iron pipe which is 28 cm long if its thickness of the pipe is 1 cm and an outer diameter is 13 cm (Jo Koi bhi ise karega mai usee ipad or laptop dungi free apna address bhej dena)
Answer:
Solution
Height of pipe
=
20
c
m
External diameter
=
25
c
m
External radius,
R
=
25
2
=
12.5
c
m
The thickness of the pipe
=
1
c
m
therefore, Internal radius,
r
=
12.5
−
1
=
11.5
c
m
Let the external radius be
R
and the internal radius be
r
.
Then Total surface area of the pipe
=
Outside surface area
+
inside surface area
+
Top Base Area
+
bottom base area
=
2
π
R
h
+
2
π
r
h
+
π
(
R
2
−
r
2
)
+
π
(
R
2
−
r
2
)
=
2
π
h
(
R
+
r
)
+
2
π
(
R
2
−
r
2
)
=
2
×
22
7
×
[
20
(
12.5
+
11.5
)
+
(
12.5
)
2
−
(
11.5
2
)
]
c
m
2
=
44
7
[
20
×
24
+
(
12.5
−
11.5
)
(
12.5
+
11.5
)
]
c
m
2
[
∵
(
a
2
−
b
2
)
=
(
a
−
b
)
(
a
+
b
)
]
=
44
7
[
480
+
24
]
c
m
2
=
44
7
[
504
]
c
m
2
=
44
×
72
c
m
2
=
3168
c
m
2
So, the total surface area of the pipe is
3168
c
m
2
Mathematics
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SIMILAR QUESTIONS
Q.
An iron pipe
20
c
m
long has exterior diameter equal to
25
c
m
. If the thickness of the pipe is
1
c
m
, find the whole surface area of the pipe.
Mathematics
Q.
A 20m long iron pipe has an exterior diameter of 25cm. If the thickness of the pipe is 1cm ,find the internal curved surface area of the pipe
Mathematics
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