Find the mean proportional between 64 & 81?	Choose one:  A) A)59  B) B)61  C) C)63  D) D)72  E) E)67
Formula = √a×b   A = 64 and B = 81   √64×81 = 8 × 9 = 72   72
<result>D</result>
Find the mean proportional between 64 & 81?