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dik : R1 = 5 cm
B2 = 15 cm
1) K1 = 2πR1
= 2×3,14×5
K1= 31,4
K2 = 2πR2
= 2×3,14×15
K2= 94,2 cm
2) K2-K1 = 94,2-31,4 = 62,8 cm
3) L1 = πR1²
=3,14×5²
L1= 78,5 cm²
L2 = πR2²
= 3,14×15²
L2= 705,5 cm²
4) L2-L1 = 705,5-78,5 = 628 cm²