The question "How may square feet is equal to 1 Anna? has been answered elsewhere on this site, the answer being "1 anna = 20.16 sq yd. Since 1 square yard is 3*3=9 square
http://wiki.answers.com/Q/How_many_Annas_is_equal_...

Air conditioners are rated by "tons" of BTUs (British thermal units) of heat that they can remove in an hour. One BTU is enough energy to raise the temperature of one pint
http://www.ehow.com/info_12206869_sizesacunitsn...

1 square equals 1. When squaring a number you multiply the number
http://www.chacha.com/question/whatdoes%26%2345%...

The product of the slopes of two perpendicula. . . .
http://www.quora.com/Mathematics/Whataresomethi...
