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616 = 3,14 × r² × 4
616 =12,56× r²
616/12,56 = r²
49 = r²
r = 7
luas selimut = 2πr × t
L = 2× 22/7 × 7 ×4
L = 44 × 4
L = 176 cm²
mohon dikoreksi jika ada kesalahan