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= 1/2×20=10cm
keliling =2 phi r
= 2×3,14×10
= 62,8
luas lingkaran = phi r kuadrat
= 3,14×10×10=314
b). diameter=5:2=2,5
keliling = 2×3,14×2,5=15,7
luas=3,14×2,5×2,5=19,625
c). diameter=6:2=3
keliling=2×3,14×3=18,84
luas=3,14×3×3=28,26
maaf kalo salah