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.
It became a standardized measurement equal to 1/640 of a square mile or 4,840 square yards. A 208.7-foot square plot equals one acre. Originally, the term used was statute acre, but since this is the universal measurement now used in the U.S., the word statute has been dropped.