JEE Main 2019 Mathematics question
If Q(0, −1, −3) is the image of the point P in the plane 3x − y + 4z = 2 and R is the point (3, −1, −2), then the area (in sq. units) of ΔPQR is:
Answer: (C)
Solution
P = (3, −2, 1); , magnitude ; area = .
If Q(0, −1, −3) is the image of the point P in the plane 3x − y + 4z = 2 and R is the point (3, −1, −2), then the area (in sq. units) of ΔPQR is:
P = (3, −2, 1); , magnitude ; area = .