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Verified answer
Jawablingkaran
r = 21
Keliling = K = pi.d = 22/7. 2. 21= 132 cm
Luas= L = pi r² = 22/7.7² = 154 cm²
Luas juring / L = panjang busur/ K
LJ / 154 = 22/132
LJ = 154 (22) / 132
LJ = 25,67