Here's the question you clicked on:
Annetta_Martin
If the radius of a circle is multiplied by 2, then how many times larger is the circumference of the new circle? 2. 4. 8. pi.
C = 2*pi*r , so if r is doubled the new C is 2*pi*2r , so it is 4pi.
well 2 times larger.
haha not quite, its just doubled. if r is double the circumference is doubled. so its just 2 times larger.
I got it now, thanks! :)
If it asks for area, the equation is \[\pi*r^2 \] so when its doubled the area quadruples. (4x times larger)