# Online Geometry: Parallel Lines, Theorems and Problems

## Parallel Lines, Page 4

Proposed Problem 251.
Parallelogram, sides, diagonals, squares, areas.

Proposed Problem 245. Parallelogram with Equilateral triangles

Proposed Problem 237. Quadrilateral, Midpoints, Exterior line, Perpendicular lines, Parallel lines.

Proposed Problem 236. Quadrilateral, Midpoints, Exterior line, Perpendicular lines, Parallel lines.

Proposed Problem 235. Parallelogram, Transversal line, Perpendicular lines, Parallel lines.

Proposed Problem 234. Parallelogram, Line through a vertex, Perpendicular lines, Parallel lines.

Proposed Problem 233. Parallelogram, Exterior line, Perpendicular lines, Parallel lines.

Proposed Problem 232. Parallelogram, Line through a vertex, Perpendicular lines.

Proposed Problem 231. Triangle, Midpoints, Transversal, Perpendicular lines, Parallel lines.

Proposed Problem 230. Triangle, Midpoints, Transversal, Perpendicular lines.

Proposed Problem 229. Triangle, Centroid, Transversal, Perpendicular lines, Parallel lines.

Proposed Problem 228. Triangle, Midpoints, Exterior line, Perpendiculars lines.

Proposed Problem 227. Triangle, Centroid, Exterior line, Perpendicular lines, Parallel lines.

Proposed Problem 226. Triangle, Centroid, Perpendicular lines, Parallel lines.

Proposed Problem 224. Viviani's theorem, Isosceles triangle, Altitude, Distances, Point on the extension of the base, Parallel lines.

Proposed Problem 223. Viviani's theorem, Isosceles triangle, Altitude, Distances, Parallel lines.

Proposed Problem 222. Viviani's theorem, Equilateral triangle, Exterior point, Distances.

Proposed Problem 221. Viviani's theorem, Equilateral triangle, Interior point, Distances, Parallel lines.

Proposed Problem 219. Rhombus, perpendiculars, arithmetic mean, Parallel lines.

Proposed Problem 218. Right triangle, Altitude and Projections, Parallel lines.

Proposed Problem 217. Right triangle, Altitude and Projections, Parallel lines.

Archimedes Arbelos and Square 2. Dynamic Geometry Software.
Step-by-Step construction, Manipulation, and animation
, Parallel lines.

Archimedes Arbelos and Square 1. Dynamic Geometry Software.
Step-by-Step construction, Manipulation, and animation
, Parallel lines.

Proposed Problem 185. Trapezoid, Triangles and Angles, Parallel lines.

Proposed Problem 179. Rhombus, Square, Diagonal, Angle, Parallel lines.

Proposed Problem 177. Parallelogram with Midpoints, Triangles, Areas, Parallel lines.

Proposed Problem 172. Trapezoid, Midpoints, Quadrilaterals, Areas, Parallel lines.

Proposed Problem 171. Trapezoid, Midpoints, Triangles, Areas, Parallel lines.

Proposed Problem 170. Trapezoid, Midpoint, Triangle, Area, Parallel lines.

Proposed Problem 169. Parallelogram, Interior and Exterior Points, Diagonals, Pentagon, Triangles, Areas, Parallel lines.

Proposed Problem 168. Parallelogram, Diagonal, Triangles, Pentagon, Areas, Parallel lines.

Proposed Problem 167. Parallelogram, Diagonal, Triangles, Areas, Parallel lines.

Proposed Problem 166. Parallelogram, Diagonal, Triangles, Areas, Parallel lines.

Proposed Problem 165. Parallelogram, Diagonal, Triangles, Areas, Parallel lines.

Proposed Problem 164. Parallelogram, Trapezoid, Diagonal, Triangles, Areas, Parallel lines.

Proposed Problem 163. Trapezoid, Diagonals, Triangles, Areas, Parallel lines.
Trapezoid Index

Proposed Problem 162. Parallelogram, Triangles, Areas, Parallel lines.

Proposed Problem 161. Parallelogram, Midpoints, Octagon, Areas, Parallel lines.

Proposed Problem 146. Varignon's Theorem: Quadrilateral, Midpoints, Parallelogram, Area, Perimeter, Parallel lines.

Proposed Problem 145. Four Triangles, Incircle, Tangent and Parallel to Side, Incenters, Circumcenters.

Proposed Problem 144. Four Triangles, Incircle, Tangent and Parallel to Side, Inradii.

Proposed Problem 143. Four Triangles, Incircle, Tangent and Parallel to Side, Circumradii.

Proposed Problem 142. Four Triangles, Incircle, Tangent and Parallel to Side, Areas.

Proposed Problem 141. Triangle, Incircle, Tangent , Parallel, Perimeters.

Proposed Problem 137. Orthic Triangle, Altitudes, Perpendicular, Incircle, Collinear Points, Parallelogram.

Proposed Problem 135. Orthic Triangle, Altitudes, Perpendicular, Parallel.

Trapezoid, Triangle, Diagonals, Midpoints. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Parallel lines. Prove proposition.

Proposed Problem 127. Centroid and Incenter of a Triangle, Parallel lines, Proportions.

Bottema's Theorem:
Triangle and Squares with Interactive Geometry Software
Step-by-Step construction, Manipulation, and animation.
Parallel lines.

Proposed Problem 112. Area of square and triangle.
Parallel lines.

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 Home | Search | Geometry | Lines | Post a comment | Email | By Antonio Gutierrez Last updated: Sep 29, 2014