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1386 = 22/7 x r x r
1387 x 7/22 = r x r
441,38 = r x r
21 = r
2 x r = 21 x 2
d = 42
= 22/7 × 21 × 21
= 22 × 3 × 21
= 66 × 21
= 1386 cm²
J = Garis Tengahnya adalah 21 cm