Meters should be used to measure the length of a tennis court in metric units.
metres
There are no units of measure suitable for measuring a sport. A tennis court, net, ball, racquet, player can all be measured, but not tennis itself!
The metric unit of volume is meter squared: m3.
Feet and inches
I think a hectometer.
Meters.
It cannot be calculated since you are using a unit of length to compare with a unit of capicity.
sot
Using Pythagoras' theorem the answer is equal to the square root of 2.
metre or feet
It is the SI unit of length.