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1,54 = 22/7 x r²
r² = 1,54 x 7/22
r² = 0,49
r = 0,7
d = 2r
d = 2 ( 0, 7 )
d = 1,4 dm = 1,4 x 10 = 14 cm
luas adalah phi x jari-jari x jari-jari
154 x 7 :22 = r kuadrat
49 = r kuadrat
7 = r
diameter = 2r
jadi diameter adalah 2 x 7 = 14 cm