# How do you solve word problems involving formulas?

Sep 20, 2015

#### Explanation:

The way you interpret the problem is the start, let me give you an example:

Triangle "1" Has 3 sides, $A$, $B$, and $C$. $A$ Is equal to $3$, $B$ is equal to $4$. Find $C$.

Using Pythagoras' Theorem, we know ${A}^{2} + {B}^{2} = {C}^{2}$

${A}^{2} = 9$, ${B}^{2} = 16 \implies {A}^{2} + {B}^{2} = 9 + 16 = 25$

SInce ${C}^{2} = {A}^{2} + {B}^{2} = 25$, you know that

$C = \sqrt{{C}^{2}} = \sqrt{25} = 5$

You simply find out what value goes with what part of the formula, and do this for each, and then work out the formula as normal.