Current location - Training Enrollment Network - Mathematics courses - The judgment and nature of straight line and straight line, straight line and plane, and plane and plane parallel in the second section of Chapter 9 of the second volume of senior one mathematics (bas
The judgment and nature of straight line and straight line, straight line and plane, and plane and plane parallel in the second section of Chapter 9 of the second volume of senior one mathematics (bas
The judgment and nature of straight line and straight line, straight line and plane, and plane and plane parallel in the second section of Chapter 9 of the second volume of senior one mathematics (basic module). 1. Let four straight lines A, B, C and D in the space satisfy a//b, b//c, c//d, and try to judge the relationship between A and D. A//D.

Exercise 9.4

1.① Two straight lines perpendicular to the same straight line in space (d)

② Both planes (b) are perpendicular to the third plane.

(3) Plane (b) that passes through two points outside the plane and is perpendicular to the plane.