Question 979185
Area of a circle = {{{pi*r^2}}} =A (say)
so,if radius is doubled,
New Area = {{{pi*(2r)^2}}} 
={{{4*pi*r^2}}} =4A
Hence area becomes 4 times and not double,
So 1st statement is wrong.

Circumference = {{{2*pi*r}}} =C (say)
so, if radius is doubled,
New circumference = {{{2*pi*2r}}} =2C
Hence, circumference is doubled,
Statement 2 is true for all cases.

Volume of cuboid(with sides a,b,c) = a*b*c = V (say)
If edges are doubled,
New volume = 2a*2b*2c =8abc = 8V
Hence, Statement 3 is wrong.

Similarly, follow for others.