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= 3,14 . 10 cm
= 31,4 cm
keliling lingkaran 2: π . d
= 3,14 . 30 cm
= 94,2 cm
b. selisih kelilingnya = 94,2 cm - 31,4 cm
= 62,8 cm
c. luas lingkaran 1: π . r²
= 3,14 . 5²
= 3,14 . 25
= 78,5 cm²
luas lingkaran 2: π . r²
= 3,14 . 15²
= 3,14 . 225
=706,5 cm²
d. selisih luas = 706,5 cm² - 78,5
= 628 cm²