Keliling lingkaran yg berjaring-jaring r=49 cm

r = 49 cm
K = 2 × phi × r
K = 2 × 22/7 × 49
K = 308 cm

[tex]k = \pi \times 2 \times r\\ k = \frac{22}{7} \times 2 \times 49 \\ k = 308cm[/tex]
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