# problem solving

• February 17th 2009, 09:06 PM
coldplayroxs
problem solving
hey guys so im stuck again

the question is

A square has an area of 400cm2
what is the length of each side?

i know its pretty easy but im sort of clueless, thanks for any help, and i apologize if im in the wrong forum (Happy)
• February 17th 2009, 09:20 PM
ixo
$A=x^2$

Area is generally: $A=l \cdot w$. But since you know its a square its $A=(w \cdot w)$ or $A=(l \cdot l)$, whichever you prefer. Then you put the numbers you know in the equation.

$400=x^2$ then remove the ^2, which is called "squared" for a reason. Square root..

$\sqrt{400}=x$ I'm sure you can do the rest.