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.
For example, to find out how many sq. feet there are in a square mile and a half, multiply the sq. mile value by 27 878 400, that makes 1.5 mi2 * 27 878 400 = 41 817 600 sq. feet in 1.5 sq. mile. Square mile is an imperial and US customary area unit and defined as the area of a square with sides 1 mile in length. 1 square mile equals to 640 acres and 259 hectares.