Question

If $\bar{AD}=r\bar{AB}$ and $\bar{AE}=r\bar{AC}$, is $\bar{DE}\parallel\bar{BC}$?

score 172 · Answer 1 · 2026-03-25 06:58:56

172

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If $\bar{AD}=r\bar{AB}$ and $\bar{AE}=r\bar{AC}$, is $\bar{DE}\parallel\bar{BC}$?

Published on 25 Mar 2026 - 6:58

score 65 · Answer 2 · 2018-02-23 22:27:30

65

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Two altitudes CE and BD are drawn in a triangle ABC. Prove that angle AED= angle BCA

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score 130 · Answer 3 · 2026-03-24 23:45:57

130

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Published on 24 Mar 2026 - 23:45

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141

Views

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score 728 · Answer 5 · 2026-03-25 01:18:12

728

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score 115 · Answer 6 · 2018-02-25 06:36:09

115

Views

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Published on 25 Feb 2018 - 6:36

score 165 · Answer 7 · 2018-02-25 15:37:19

165

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score 314 · Answer 8 · 2026-03-22 11:24:59

314

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67

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180

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133

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score 150 · Answer 12 · 2026-03-25 18:14:15

150

Views

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Published on 25 Mar 2026 - 18:14

score 1.4k · Answer 13 · 2026-03-25 10:21:47

1.4k

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In the triangle ABC, D and E are the midpoints of AC and BC. AE and BD intersect at F. How to show that the area of CDFE equals the area of AFB?

Published on 25 Mar 2026 - 10:21

score 109 · Answer 14 · 2018-02-27 13:53:45

109

Views

Proving every orientation reversing motion of $\mathbb{E}^2$ is a composite of a half-turn and a reflection.

Published on 27 Feb 2018 - 13:53

score 61 · Answer 15 · 2018-02-27 22:08:17

61

Views

find the two circles inscribed by three lines

Published on 27 Feb 2018 - 22:08

List Question

If $\bar{AD}=r\bar{AB}$ and $\bar{AE}=r\bar{AC}$, is $\bar{DE}\parallel\bar{BC}$?

Two altitudes CE and BD are drawn in a triangle ABC. Prove that angle AED= angle BCA

Find $R$ such that the man covers shortest distance.

Prove similarity of triangles

A half-circle is inscribed in a square such that its diameter is the side length of the square

Show that if there are $4$ points and $3$ of them are on a circle, then the last point has to be on the circle if......

Geometry and van Aubel's theorem

What is the locus of a variable point inside a square?

geometry with $T$

First Order Logic and Euclidean Geometry System

6-polytope with 8 vertices

Ratio of the area of a triangle and the area of a square containing it

In the triangle ABC, D and E are the midpoints of AC and BC. AE and BD intersect at F. How to show that the area of CDFE equals the area of AFB?

Proving every orientation reversing motion of $\mathbb{E}^2$ is a composite of a half-turn and a reflection.

find the two circles inscribed by three lines

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