Question

Find the area of a circle with radius 5 ft.

Use the value 3.14 for it, and do not round your answer.

Answer 1

The area is:

78.5 ft²

Step-by-step explanation:

To find the circle's area, use the formula
`\sf{A=\pi r^2}`.

where:

A = area;

π = 3.14 (pi);

r = radius

Diagram:

`\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\qbezier(2.3,0)(2.121,2.121)(0,2.3)\qbezier(-2.3,0)(-2.121,2.121)(0,2.3)\qbezier(-2.3,0)(-2.121,-2.121)(0,-2.3)\qbezier(2.3,0)(2.121,-2.121)(-0,-2.3)\put(0,0){\line(1,0){2.3}}\put(0.5,0.3){\bf\large 5\ ft}\end{picture}`

Plug in the data:

• 
  `\sf{A=3.14*5^2}`
• 
  `\sf{A=3.14*25}`
• 
  `\bf{A=78.5\:ft^2}`

Answer 2

A = 78.5 ft^2

Step-by-step explanation:

A = 3.14 x 5^2

= 3.14 x 25