W r i t e space a n space e q u a t i o n space t h a t space e x p r e s s e s space t h e space r e l a t i o n s h i p. space space U s e space k space a s space t h e space c o n s tan t space o f space v a r i a t i o n. c space v a r i e s space d i r e c t l y space a s space t h e space s q u a r e space o f space h c equals k over h squared c equals k h squared c equals fraction numerator k over denominator square root of h end fraction c equals k square root of h