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1386= 22/7 x r kuadrat
1386x 7 / 22 = r kuadrat
441= r kuadrat
21= r
jadi a. jarijari lingkaran= 21
b. diameter lingkaran = r x 2 = 21x2=41
1386 = 22/7 x r kuadrat
r kuadrat = 1386 x 7 : 22
r = akar 441
= 21 cm
d = 21 x 2
= 42 cm