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area = 2 · π · r · (r + h)=surface area
lateral area = 2*3.14*rh
I must be doing it wrong because ive tried both ways and i still get it wrong
what are the figures?
A=2πrh (for lateral area)
it says use the net to find the latreal area of the clyinder diamter is 12 hieght is 15
also says give your answer in pi , which i dont understand
im using the correct formula but i still get it wrong
since the diameter is 12 the radius will be 6 since tha radius is half of diameter
the answer i got for surface area is 791.68
thats the same that i got , it still says incorrect
probably approximate it
565.49 for the lateral area
nope , neither work , ive tried it all it still says its incorrect , maybe because it says it needs to be in pi?
i guessing you should put pi at the end of the answer??
I have tried that too!!! This is driving me insane!!
did you put the units cm or m^2 since its area
yes i did
Do you have to show working??
No i dont have to show my work
do you see the cylinder? surface area is made up of 2 circles area of each is Pi * r^2 where r is the radius of the circle and the lateral surface which is like a rectangle if you were to "open" down the side. the length the circumference of the circle, 2*pi* r and the width is the height of the cylinder, h
total surface area = 2*pi*r^2 + 2*pi*r*h = 2 *pi*r ( r + h)
OHHH ok now its correct!!! THANK YOU
the diameter here is 12 which is 2*r so r = 6 the height is 15 substituting in the formula use 3.14 for pi unless told to give exact
Nope! Just forgot to close it lol XD