khoirotunnisak
Kel.lingkaran = 2 π r 220 = 2 . 22/7 x r 220 = 44/7 r r = 220 44/7 = 220 x 7/22 = 35 L.lingkran = πr² = 22/7 x 35 x 35 = 3850 L.juring = α x l.lingkaran 360 = 90 x 3850 360 = 962,5 (c)
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Asuna
Keliling lingkaran = 2 π r 220 = 2 x 22/7 x r 220 = 44/7 r r = 220 x 7/44 r = 70/2 r=35 Luas lingkaran = π r² Luas lingkaran = 22/7 x 35 x 35 = 3850 Ket : Sudut juring yg diarsir siku2 jd 90° Luas juring = Luas lingkaran x sudut yg diketahui / 360 Luas juring = 3850 x 90°/360° Luas juring = 3840 / 4 = 962,5
220 = 2 . 22/7 x r
220 = 44/7 r
r = 220
44/7
= 220 x 7/22 = 35
L.lingkran = πr² = 22/7 x 35 x 35 = 3850
L.juring = α x l.lingkaran
360
= 90 x 3850
360
= 962,5 (c)
220 = 2 x 22/7 x r
220 = 44/7 r
r = 220 x 7/44
r = 70/2
r=35
Luas lingkaran = π r²
Luas lingkaran = 22/7 x 35 x 35 = 3850
Ket : Sudut juring yg diarsir siku2 jd 90°
Luas juring = Luas lingkaran x sudut yg diketahui / 360
Luas juring = 3850 x 90°/360°
Luas juring = 3840 / 4 = 962,5