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L = phi r^2
154 = 22/7 x r^2
r^2 = 154 x 7/22
r^2 = 49
r = 7
d = 2 x 7 = 14
Jari-jari = √(Luas x 7) : 22) = √(1,54 x 7) : 22) = √10,78 : 22 = √0,49 = 0,7 dm
= 7 cm
Diameter = 2 x jari-jari = 2 x 7 = 14 cm