Make d the subject of the relation . R= d^2/8h+h/2

Answer 1

d²/8h+h/2=R??

d²/8h+h/2=R

Multiply through by 8h

d²+4h²=8Rh

d²=8Rh-4h²

d=√[8Rh-4h²] or d=2√(2Rh-h²)