Question

D^2 + (1/8×22/7×D^2)=78
D^2 = ?
Mohon Bantuannya Kak​

Answer 1

D² + (⅛ x 22/7 x D²) = 78

(1+ 22/56) D² = 78

78/56 D² = 78

D² = 78 x 56/78 = 56

D = √56 = 2√14