Basic Math Examples



$\begin{array}{r} r = & 9 \end{array}$

Step 1

The area of a circle is equal to Pi

$π$ times the radius

$r$ squared.

$π \cdot {(r a d i u s)}^{2}$

Step 2

Substitute in the value of the radius

$r = 9$ into the formula for the area of a circle. Pi

$π$ is approximately equal to

$3.14$ .

$π \cdot 9^{2}$

Step 3

Raise

$9$ to the power of

$2$ .

$π \cdot 81$

Step 4

Move

$81$ to the left of

$π$ .

$81 π$

Step 5

The result can be shown in multiple forms.

Exact Form:

$81 π$

Decimal Form:

$254.46900494 \dots$

 $\begin{array}{r} r = & 9 \end{array}$

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