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luas juring 10cm² r= 4 cm. panjang busur ?
luas lingkaran = πr²= 3,14 × 4×4 = 50,24 cm²
keliling lingkaran = 2πr = 2×3,14× 4= 25,12cm
Ljuring/L lingkaran= panjang busur/K lingkaran
10/59,24= panjang busur/ 25,12
panjang busur= (10×25,12)/50,24= 251,2/50,24
= 5 cm