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Verified answer
Lingkarana. Diameter 43 cm
Jari-jari = ½ × diameter
Jari-jari = ½ × 43 cm
Jari-jari = 21,5 cm
b. Luas 616 cm²
L = πr²
616 = 22/7 × r²
r² = 616 × 7/22
r² = 196
r = √196
r = 14 cm