Alfina Grinadina - X MIPA 2

NAMA: ALFINA GRINADINA KELAS: X MIPA 2 ABSEN: 6 link soal :  https://lizzanovrida-education.blogspot.com/2021/ 6. Diketahui titik p (-8-11-15) q (-11,20,10) dan r (12,22,-20) jika pq=a dan qr + pr = b maka a.b JAWABAN:     • PQ = q-p = (-11,20,10) - (-8,-11,-15)                       = -3,31,25    • QR = r-q = (12,22,-20) - (-11,20,10)                     = 23,2,-30    • PR = r-p = (12,22,-20) - ( -8,-11,-15)                     = 20,30,-5        - -> QR + PR = 23,2,-30 + 20,30,-5                      = 43,32,-35 maka,  a.b = (-3.43 + 31.32)       = -129 + 992       = 863