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graydarl
We have A(1; 2; 1), B (1; 2; 3), C (2; 2; 2), pi: x-2y + 2z = 0, d : (x-1)/2= y/(-1)=(z-1)/(-2) We must show that: 1. Area of triangle ABC 2. Equation of ABC plane 3. Distance from A to pi plane 4. Distance from A to d line 5.Equation of the perpendicular line from A to ABC plane please help me