If this attribute is not specified, this <input> element must be a descendant of a <form> element. This attribute enables you to place <input> elements anywhere within a document, not just as descendants of their form elements.
A circular area of 5 miles radius covers 50265.5 acres (to 1 dp) Area = pi*radius2, which with radius in miles will give you area as 78.53982 square miles, then multiply by 64 â¦ 0, since there are 640 acres in 1 square mile.
The formula for the area of a circle is: Area = Ï * radiusÂ² . If the radius is given in feet, the area is in square feet. To convert from square feet to acres, divide by 43560.So the acreage of a circular area is: Acres = Ï * radius_in_feetÂ² / 43560. need a software mapping program that will allow me to draw a circle of varying radius and tell me how many acres in that circle.