math
posted by leroy .
The area of some shape varies directly with the square of its side. If a shape with 2cm sides has an area 10cm^2,what would be the area of a shape ofthe same type with side of 3cm.

area=k*s^2
10=k*2^2 or k= 2.5
area= 2.5*3^2=2.5*9= you do it. 
thank you, i think i got it now.