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Mathematics
Stelios Petrolekas's user avatar
Stelios Petrolekas's user avatar
Stelios Petrolekas's user avatar
Stelios Petrolekas
  • Member for 1 year, 3 months
  • Last seen this week
  • Greece
Profile Activity

16 Questions

Score Activity Newest Views
5 votes
3 answers
114 views

Isosceles trapezoid and rhombus from angle bisectors in a square

5 votes
3 answers
91 views

Orthocenter in obtuse triangle from square and equilateral triangle configuration

4 votes
2 answers
111 views

Perpendicular from vertex in square - angle problem

3 votes
4 answers
155 views

Properties of incenter and angle bisectors in a square

3 votes
3 answers
135 views

Prove that triangle CHL is isosceles in rectangle with specific construction

2 votes
5 answers
184 views

Perpendiculars passing through diagonal intersection in a quadrilateral formed within a square

2 votes
5 answers
215 views

Prove that triangle BNC is isosceles in a 30-60-90 construction

2 votes
1 answer
122 views

A square configuration leading to an isosceles trapezoid and $FB =\frac{na}{(2n+1)(n+1)}$

2 votes
3 answers
122 views

Equilateral triangle from midpoints and circle intersections

2 votes
4 answers
216 views

Perpendiculars to the diagonal of a square

1 vote
1 answer
155 views

Isosceles trapezoid and special triangles in a square with perpendicular construction

0 votes
2 answers
85 views

Parallelogram formed by altitude, perpendicular construction, and angle bisector in a triangle

0 votes
1 answer
75 views

Collinearity of three points in a square with perpendicular and parallel constructions

0 votes
5 answers
235 views

Semicircle with tangent and perpendicular: prove that DE·BC = CD·R [closed]

0 votes
3 answers
119 views

# Concyclicity and Power of a Point in a Circle

-1 votes
3 answers
120 views

Perpendicular segments from special points in a rectangle with ratio $BC = 2AB$