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D=diameter=2*jari-jari
r=49cm; D=98cm
r=21cm; D=42cm
r=5cm; D=10cm
r=12cm; D=24cm
r=10,5cm; D=21cm
keliling=π*D
luas=π*r*r
π= 22/7 atau 3,14
a)
keliling=22/7*98=308cm
luas=22/7*49*49=7546cm
b)
keliling=22/7*42=132cm
luas=22/7*21*21=1386cm
selanjutnya hitung sendiri ya