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616 = x r² x 4
616 = x r²
616 : = r²
616 x = r²
7 x 7 = r²
49 = r²
√49 = r
7 = r
L. Selimut = 2 r t
L. Selimut = 2 x 7 x 4
L. Selimut = 44 x 4
L. Selimut = 176 cm²