# 7. If we invent the line at infinity in the projective plane, then it is possible to construct one line perpendicular to a given line at a given point. Assuming this is true, given triangle ABC, which of the following is still impossible to construct using only projective geometry? (A) the orthocenter (C) the circumcenter (B) the incenter (D) the centroid

# 7. If we invent the line at infinity in the projective plane, then it is possible to construct one line perpendicular to a given line at a given point. Assuming this is true, given triangle ABC, which of the following is still impossible to construct using only projective geometry? (A) the orthocenter (C) the circumcenter (B) the incenter (D) the centroid

Algebra for College Students

10th Edition

ISBN:9781285195780

Author:Jerome E. Kaufmann, Karen L. Schwitters

Publisher:Jerome E. Kaufmann, Karen L. Schwitters

Chapter13: Conic Sections

Section13.1: Circles

Problem 47PS

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