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Mapel : MatematikaBab : Busur dan Juring Lingkaran
Diketahui :
Panjang jari-jari lingkaran (r) = 21 cm
Besar sudut pusat = 45°
Ditanyakan :
Panjang busur = ..?
Penyelesaian :
Panjang busur
= Sudut pusat / 360° x Keliling lingkaran
= 45° / 360° x 2 x π x r
= 1/8 x 2 x 22/7 x 21 cm
= 16,5 cm