A right angled triangle whose base is 21 cm and height in 20 cm , is made to turn round on the longer side. if the volume of the solid , thus generated V and cubed curved surface area is S, then _____
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Answered by
2
Height of core formed = 21cm
Radius of the core = 20cm
Volume = πr
2
h/3
=22∗20∗20∗21/7∗3
=22∗400
=8800cm 2
Step-by-step explanation:
Answered by
5
Answer:
Radius = 21
Height= 20
Volume of the solid ( cone) = 1/3 π r^2h
= 1/3 ×22/7 × 21 × 21× 20
= 9240 cm^3
By Pythagoras theorem
l= √r^2+h^2
l= √21^2+ 20^2
l= √441+400
l= √841
l= 29
CSA= πrl
= 22/7× 21× 29
= 1914 cm^2
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