Asked by beeca

how would you find the surface area of a cylinder with 1.7m for the diameter, and 3m for the height? would you use the formula S.A = 2pi x r x h, or S.A = area of two congruent circles + area of rectangle?
Answered by drwls
Neither. The curved surface area is 2*pi*r*h (or pi*D*h), but you have to add to that the total area of the top and bottom, 2*(pi/4) D^2
Answered by beeca
thanks, but im pretty sure i said 2*pi*r*h , except a different way
Answered by beeca
whats the difference between the curved surface area and the surface area?
Answered by drwls
the top and bottom areas are the difference
Answered by beeca
ok, thanks. i also have another question. A fruit can has diameter 5.8cm and height 10.5cm. A plastic label wraps around the can. What is the area of the plastic label? Would the formula be S.A = L*W ?
Answered by Reiny
your label is a rectangle with a length equal to the circumference of the circle
so area
= 2pi(2.9)*10.5
= ....
Answered by beeca
why did u put 2.9 in brackets, is that what it equals or is it part of the equation?
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