15. Keliling lingkaran tersebut adalah....
A. 44 cm B. 72 cm C. 144 cm D. 172 cm
A. 44 cm B. 72 cm C. 144 cm D. 172 cm
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Jawaban:
r = 28/2
r = 14 cm
½2πr + 2.r
½.2.22/7.14 + 2.14
½.44/7.14 + 28
22 × 2 + 28
44 + 28
72 cm