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Luas = phi x r²
154 = 22/7 x r²
r² = 1,54 x 7/22
r² = 49
r = √49
r = 7 cm
Diameter = 2 x r
= 2 x 7
= 14 cm
L=1/4.pi.d^2
154=1/4.pi.d^2
616=pi.d^2
616=22/7.d^2
4312=22d^2
d=14