Rasheed got a playing top (lattu) as his birthday present, which surprisingly had no colour on it. He wanted to colour it with his crayons. The top is shaped like a cone surmounted by a hemisphere. The entire top is 5 cm in height, and the diameter of the top is 3.5 cm. Find the area he has to colour. (Take π = 22/7)
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Faltu ka answer mt do re -_-
Answers
Answered by
7
Answer
We have,
Radius of hemispherical portion of the lattur=
2
3.5
=
4
7
cm
Radius of the conical portion r=
2
3.5
=
4
7
cm
Height of the conical portion h=(5−
2
3.5
)=
4
13
cm
Slant height of the conical part l=
r
2
+h
2
l=
(
4
7
)
2
+(
4
13
)
2
=
4
218
=3.69cm≈3.7cm
Total surface area of the top will be,
2πr
2
+πrl=πr(2r+l)=
7
22
×
4
7
(2×
4
7
+3.7)=39.6cm
2
Answered by
4
Answer:
R.E.F image
Given
Surface area =πrl+2πr
2
Here r=
2
3.5
=1.75cm
l=
(3.25)
2
+(1.75)
2
=
13.625
l=3.6912cm
So, Area he has to color =
7
22
(1.75)(3.6912)+2×
7
22
(1.75)
2
=20.3016+19.25
=39.5516cm
Explanation:
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