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Jari-jari = r = 28÷2 = 14 cm
• Luas = phi × r pangkat 2
= 22/7 × 14 pangkat 2
= 22/7 × 196
= 616 cm persegi
• Keliling = phi × D
= 22/7 × 28
= 88 cm
R (Jari-jari) = GT ÷ 2
= 28 cm ÷2
= 14 cm
Luas = 22/7 × R × R
= 22/7 × 14 cm × 14 cm
= 616 cm2