a solid cylinder head has a total surface area of 462 square kilometre its curved surface area is one third of its total surface area find the radius of the cylinder?
Answers
Answered by
1
Answer:
the radius is 7km
first put the value of c.s a. in the formula of t.s.a. so equate the following
Attachments:
Answered by
1
Answer:
TSA = 2πrh+2πr^2=462 km2.
CsA = 2 πrh=462/3=154
subtraction.gives 2πr 2
2 πr 2 = 462-154=308
r^2 =308/2π =308x7/22x2 = 49
r=v49=7km.
Radius = 7 km
Similar questions