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r2 = 15 cm
K1 = 2 x 5 x 3,14 = 31,4 cm
K2 = 2 x 15 x 3,14 = 94,2 cm
selisih = K2 - K1 = 94,2 - 31,4 = 62,8 cm
L1 = 5 x 5 x 3,14 = 78,5 cm2
L2 = 15 x 15 x 3,14 = 706,5 cm2
selisih = 706,5 - 78,5 = 628 cm2
a) 5 : 15 = 1 : 3
b) selisih = 2π(5) - 2π(15) = 20π = 62,8 cm
c) 5² : 15² = 25 : 225 = 1 : 9
d) selisih luas = π(15)² - π(5)² = 200π