hitunglah keliling bangun berikut jari² 28 cm

r=28 cm
K=?
[tex]keliling = \pi \times d \\ \frac{22}{7} \times 56 \\ 22 \times 8 = 176 \: cm[/tex]
[tex]keliling = 2 \times \pi \times r \\ 2 \times \frac{22}{7} \times 28 \\ 2 \times 22 \times 4 = 176 \: cm[/tex]