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= 22/7 x 7 x 7 : 2
= 77 cm²
L2 = x r x r : 2
= 22/7 x 14 x 14 : 2
= 308 cm²
L3 = s x s
= 21 x 21
= 441 cm²
Larsir = L3 - (L2+L1)
= 441 - (308+77)
= 56 cm²