$\"\"$

The circumference of the circle is $\"\"$ .

The circumference of a circle formula is $\"\"$

$\"\"$ (Substitute 51 for C and 3.14 for $\"\"$ )

$\"\"$ (Multiply: $\"\"$ )

$\"\"$ (Divide each side by 6.28)

$\"\"$ (Cancel common terms)

$\"\"$ in. (Divide: $\"\"$ )

$\"\"$ in. (Rounded to nearest whole number) $\"\"$

The diameter of a circle is twice to its radius, $\"\"$ .

$\"\"$

$\"\"$ in. (Rounded to nearest whole number)

$\"\"$

The radius and diameter of the circle are 8 in. and 16 in. respectively.