Root of ( 20^2 - 16^2 ) = 12
6/10 is equal to 0.60
9/12 is equal to 0.75
your answer is not above for D but if D is < then that would be the correct answer :)
Let's see what to do buddy...
____________________________
Reminder:

So we need to just Multiply above equations like this :




____________________________
And we're done.
Thanks for watching buddy good luck.
♥️♥️♥️♥️♥️