$\"\"$

The diameter of the floor is 85 ft.

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

$\"\"$ $\"\"$

The area of a circle is $\"\"$

$\"\"$ (Substitute 3.14 for $\"\"$ and 42.5 for r)

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

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

$\"\"$ (Rounded to nearest square foot) $\"\"$

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