1. The projection of triangles Projective geometry evolved out of the geometric perspective, beloved of Renaissance architects, engineers and painters.

2. We shall interrupt the history of projective geometry.

3. The synthetic geometers were developing projective geometry.

4. American mathematician noted for his work on projective geometry and topology.

5. According to the fUndamental theorem of coniC In projective geometry any five points can decide one conic section.

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6. For projective geometry, we made use of homogeneous vectors and regarded them as points.

7. In this paper , the bar fixing problems of spatial four _ bar mechanism are discussed applying projective geometry.

8. Connected graded algebra is the main object studied in noncommutative projective geometry.

9. Cross ratio and element at infinity are two important concepts with projective geometry and primary tools in considerate projective property of figures.

10. In this paper, the existence theorem of midpoint chord of quadratic curve, as well as its proof, is given via methods of projective geometry and polarity principle.

11. The concept of weak block design is proposed in this paper. Based on affine geometry and projective geometry, affine manifold codes and projective manifold codes are constructed.

12. Application of the oblique projection shifting method for solving someproblem in projective geometry is presented in this paper.

13. In the calibration of the system, a plan based on the principle of cross ratio invariance in algebraic projective geometry was used to calibrate the coded light planes.

14. This paper deals with the graphics of the intersections and common tangents of two conics according to projective geometry .