Basic Math Examples

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\begin{matrix} r = & 7.5 \end{matrix}

$\begin{array}{r} r = & 7.5 \end{array}$

Step 1

The circumference of a circle is equal to Pi

π

$π$ times the diameter

d

$d$ .

π \cdot (d i a m e t e r)

$π \cdot (d i a m e t e r)$

Step 2

Since the diameter

d

$d$ is equal to

2

$2$ times the radius

r

$r$ , the formula for circumference using radius is

2 π r

$2 π r$ .

2 π \cdot (r a d i u s)

$2 π \cdot (r a d i u s)$

Step 3

Substitute the value of the radius

r = 7.5

$r = 7.5$ into the formula for the area of a circle. Pi

π

$π$ is approximately equal to

3.14

$3.14$ .

2 \cdot π \cdot 7.5

$2 \cdot π \cdot 7.5$

Step 4

Multiply

2 π \cdot 7.5

$2 π \cdot 7.5$ .

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Step 4.1

Multiply

7.5

$7.5$ by

2

$2$ .

15 π

$15 π$

Step 4.2

Multiply

$15$ by

$π$ .

$47.1238898$