C = ( x, y)
→ →
2*AC = CB
2*[ x − 2, y − 4] = [ 3 − x, 8 − y]
[ 2 x − 4 , 2 y − 8 ] = [ 3 − x , 8 − y]
2 x − 4 = 3 − x i 2 y − 8 = 8 − y
3 x = 7 i 3 y = 16
| 7 | 16 | |||
x = | i y = | |||
| 3 | 3 |
| 7 | 16 | |||
C = ( | , | ) | ||
| 3 | 3 |
