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K2 = 3,14 × 30 = 94,2 cm
b. selisih keliling = K2 - K1 = 94,2 cm - 31,4 cm = 62,8 cm
c. L1 = 3,14 × 5 × 5 cm2
= 78,5 cm2
L2 = 3,14 × 15 × 15 cm2
= 706,5 cm2
d. selisih luas = L2 - L1 = 706,5 - 78,5 = 628 cm2
B.
C,
D.