1.Tentukan jari-jari lingkaran jika keliling lingkaran 66 cm. ( phi=22/7 ) 2.Diketahui panjang busur BC 4 cm.Besar sudut BOC 30' .Tentukan panjang busur AC.
Berlincha
1. Keliling = 2 π r 66 = 2 x x r 66 = x r r = 66 : = 66 x = 10,5 cm
2. cara cepatnya: =
= 30 AC = 600 AC =20
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5dregensleyerjawaban nomer 1 kliling lingkaran = 66 2 x π x r = 66 2 x 22/7 x r = 66 44/7 x r = 66 r = 66 x 7/44 r = 3 x 7/2 r = 21/2 r = 10,5 jawabannya 10,5
jawaban nomer 2 30/360 x kO = 4 1/12 X kO = 4 kO = 4 X 12/1 = 48 busur = 150/360 x kO = 5/12 x 48 = 5 x 4 = 20 cm
66 = 2 x x r
66 = x r
r = 66 :
= 66 x
= 10,5 cm
2.
cara cepatnya:
=
=
30 AC = 600
AC =20
kliling lingkaran = 66
2 x π x r = 66
2 x 22/7 x r = 66
44/7 x r = 66
r = 66 x 7/44
r = 3 x 7/2
r = 21/2
r = 10,5
jawabannya 10,5
jawaban nomer 2
30/360 x kO = 4
1/12 X kO = 4
kO = 4 X 12/1
= 48
busur = 150/360 x kO
= 5/12 x 48
= 5 x 4
= 20 cm