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k = phi. 2.r
L = phi. r²
4.
k = 44 cm
22/7. 2.r = 44
r = 7 cm
L = 22/7.7.7 = 154 cm²
5.
k = 352 dm
22/7.2.r = 352
r = 56 dm
d = 56 x 2 = 112 dm
L = 22/7. 56² = 9856 dm²