$\"\"$

\

The given diameter of the circle is 12.8 cm.

\

Since radius is one half of the diameter. So, $\"\"$ . $\"\"$ Circumference of a circle formula is $\"\"$ .

\

$\"\"$

\

$\"\"$ (Substitute $\"\"$ )

\

$\"\"$ (Multiply)

\

$\"\"$ ( $\"\"$ ) $\"\"$

\

Area of a circle is $\"\"$ .

\

$\"\"$

\

$\"\"$ (Substitute $\"\"$ )

\

$\"\"$ (Evaluate power $\"\"$ )

\

$\"\"$ (Multiply)

\

$\"\"$ ( $\"\"$ ) $\"\"$

\

The circumference and area of the circle are 40 and 129 respectively.