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a. K = πd
= x 98
= 308 cm
b. K = πd
= x 42
= 132 cm
c. K = πd
= x 70
= 220 cm
d. K = πd
= x 2,8
= 8,8 cm
2. Panjang tali u/ meneliti sebuah drum sbyk 5 putaran
= 5 x K lingkaran
= 5 x π x d
= 5 x 3,14 x 6
= 30 x 3,14
= 94,2 cm