Kakak mohon bantuan untuk soal ini. Vektor vektor posisi dari dua titik A dan B terhadap O adalah ( 3 , -2) dan (6,2) . Cari vektor posisi dari titik S jika A. S titik tengah AB B. SA = 3SB C. OSAB sebuah jajargenjang
DB45
A) S ditengah AB AS = SB s-a = b - s s +s = a + b 2s =a + b s = 1/2 (a + b) s = 1/2 { (3+6), (-2 +2)} S= (9/2, 0)
b. SA = 3SB a - s = 3 (b-s) a - s = 3b - 3s 3s - s = 3b - a 2s = 3b - a S = 1/2 [ 3b - a ] S = 1/2 [ 3(6,2) - (3 ,-2)] S = 1/2 [ (18,6) -(3, -2)] S = 1/2 {(18-3),(6 +2)} S = 1/2 {(15, 8)} S = (15/2 , 4)
3)titik S jika OSAB jajar genjang S = OB- OA S = (6, 2)- (3, -2) S = (6-3), (2 +2) S = (3, 4)
AS = SB
s-a = b - s
s +s = a + b
2s =a + b
s = 1/2 (a + b)
s = 1/2 { (3+6), (-2 +2)}
S= (9/2, 0)
b. SA = 3SB
a - s = 3 (b-s)
a - s = 3b - 3s
3s - s = 3b - a
2s = 3b - a
S = 1/2 [ 3b - a ]
S = 1/2 [ 3(6,2) - (3 ,-2)]
S = 1/2 [ (18,6) -(3, -2)]
S = 1/2 {(18-3),(6 +2)}
S = 1/2 {(15, 8)}
S = (15/2 , 4)
3)titik S jika OSAB jajar genjang
S = OB- OA
S = (6, 2)- (3, -2)
S = (6-3), (2 +2)
S = (3, 4)