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= 84°/360° x 3,14 x 18 x 2
= 7/30 x 113,04
= 26,376 cm
B.) Luas Juring AoB
= 7/30 x 3,14 x 18²
= 7/30 x 1.017,36
= 237,384 cm²
a.) Pb
= 84/360 × 2πr
= 7/30 × 2 × 3,14 × 18
= 26,376 cm
b.) Lj
= 84/360 × πr²
= 7/30 × 3,14 × 18 × 18
= 237,384 cm²