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44 = 2 . pi . r
pi . r = 44÷2 = 22 cm
r = 22 ÷ pi
r = 22 ÷ 22/7
r = 22 x 7/22
r = 7 cm
d = r x 2 = 7 x 2 = 14 cm
44= 22/7 x diameter
diameter= 44 : 22/7
diameter= 44 x 7/22
diameter= 14 cm
jari-jari= 4:2
jari-jari= 7 cm