### Home > INT2 > Chapter 6 > Lesson 6.1.1 > Problem6-10

6-10.

Rewrite each formula as indicated below.

1. The distance an object has fallen under the force of gravity ($g$) is given by the formula $d =\frac { 1 } { 2 }gt^2$. Solve this formula for time, $t$ .

First, isolate the $t^2$. Then undo the exponent.

$t\ =\ \sqrt{\frac{2d}{g}}$

2. The area of a circle, $A$, is given by the formula $A = πr^2$. Solve this formula for the radius, $r$.

Divide by $π$.