Your are viewing a read-only archive of the old DiS boards. Please hit the Community button above to engage with the DiS !
if the surface area of a circle doubles. by how much does the radius increase?
Don't use 'surface area' in reference to 2-dimensional objects though.
I don't know
where r = radius
Imagine that ? is a pi
2r^2 = s^2
(rt2)r = 2
pieces_of_reece is correct
a simpler way to do this is to say that the 2-dimensional or quadratic scale factor of enlargement (the area) is always the same as the 1-dimensional or linear scale factor of enlargement (the length) squared