5dregensleyer
19.) rumus tembereng = 2/7 x r² l.temberng = 2/7 x 12 x 12 = 41,04 20.) sudut AOB ? AOB = 2 x 30 = 60 luas juring ? Lj = 60/360 x luas lingkaran = 1/6 x 3,14 x 30 = 1/3 x 3,14 x 15 = 1/3 x 47,1 = 15,7
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DiahYusi
maaf, tapi no.20 luas lingkarannya, seharusnya jari-jari dipangkatkan 2
5dregensleyer
ah ia lupa aku belum dikalikan 30 lg ..
l.temberng = 2/7 x 12 x 12
= 41,04
20.) sudut AOB ?
AOB = 2 x 30
= 60
luas juring ?
Lj = 60/360 x luas lingkaran
= 1/6 x 3,14 x 30
= 1/3 x 3,14 x 15
= 1/3 x 47,1
= 15,7