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Dik:r :21 cm
sp:72°
ssp:360°
π : 22/ 7
Dit : Panjang busur PQ?
Jawab!
Cari dulu Keliling lingkaran nya....
Keliling linggkaran =2×π×r
=2×22/7× 21
=132 cm
Sp/ssp = pb/Kelililing lingkaran
72°/360° = pb/132
1/5 = pb/132
1/5×132 = pb
132/5 = pb
26,4 Cm = Pb
Jadi jawaban nya B.26,4 cm