Any angle can be accomplished when throwing a football with practice. Take a rope and place it where you threw the football. Then stretch it down to where the football lands. Then measure the rope.
A tape measure.
A tape measure.
Take a tape measure and measure the distance around the football at the center. Then, take that number and divide it by 3.14, then divide that by 2.
A centimetre.
use inches
Football fields
on the foot ball field
an Obisometer
Metres, to measure its length or width, square metres to measure its area.
The only reason that I can think of is that you want to communicate with a person who is not familiar with the English system - football rules measure the field in yards or feet, so square meters is an unnatural measure for them.
Neither. By centimeters