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![Machu Picchu, Geometry Theorems and Problems, Online Education](../machu_picchu_h1_910x120.jpg)
Perpendicular Lines, Theorems
and Problems - Table of Content (3)
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![Perpendicular Lines Index](perpendicular_lines_index_1.jpg) |
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![Geometry problem 1200](../school-college/2/p1200-square-triangles-90-degrees-area-1.jpg) |
Geometry Problem 1200
Square, Right Triangle, Perpendicular, 90 Degrees, Equal Areas. |
![Geometry problem 1198](../school-college/2/p1198-right-triangle-square-rectangle-quadrilateral-area-1.jpg) |
Geometry Problem 1198
Right Triangle, Square, Rectangle, Quadrilateral, Altitude, Equal Areas. |
![Geometry problem 1194](../school-college/2/p1194-equilateral-triangle-parallel-perpendicular-metric-relations-1.jpg) |
Geometry Problem 1194
Equilateral Triangle, Perpendicular, Distance, Side, Metric Relations. |
![Geometry problem 1180](../school-college/2/p1180-triangle-quadrilateral-120-degrees-bisector-1.jpg) |
Geometry Problem 1180
Quadrilateral, 120 Degrees, Diagonals, Perpendicular. |
![Geometry problem 1169](../school-college/2/p1169-ortholine-complete-quadrilateral-steiner-line-tutoring-1.jpg) |
Geometry Problem 1169
Complete Quadrilateral, Orthocenters of the Component Triangles, Collinear Points, Ortholine, Steiner-line, Orthocentric line. |
![Geometry problem 1167](../school-college/2/p1167-triangle-circumcircle-perpendicular-collinear-points-math-1.jpg) |
Geometry Problem 1167.
Triangle, Circle, Circumcircle, Perpendicular, 90 Degrees, Collinear Points. |
![Geometry problem 1165](../school-college/2/p1165-right-triangle-circle-perpendicular-perimeter-metric-relations-1.jpg) |
Geometry Problem 1165.
Right Triangle, Circle, Center, Radius, Cathetus, Perpendicular, 90 Degrees, Perimeter, Metric Relations. |
![Geometry problem 1163](../school-college/2/p1163-isosceles-triangle-double-angle-circle-cyclic-problem-solving-1.jpg) |
Geometry Problem 1163.
Isosceles Triangle, Congruence, Double Angle, Circle, Concyclic Points, Circumcenter, Perpendicular, Angle Bisector. |
![Geometry problem 1157](../school-college/2/p1157-four-tangent-circles-90-degrees-metric-relations-1.jpg) |
Geometry Problem 1157.
Four Circles, Mutually Tangent, 90 Degrees, Radius, Metric Relations. |
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