Geometry problem regarding an isosceles triangle
40615
Solve for $x$ in the $80^\circ$-$80^\circ$-$20^\circ$ triangle
124933
Isometry group question
111042
A geometry problem from high school Olympiad selection round
33027
Maximum area of a square in a triangle
125171
Help with this trigonometry problem?
127866
Two triangles and their content ratio
127004
Extreme of $\cos A\cos B\cos C$ in a triangle without calculus.
17801
Isosceles triangle has the least perimeter among triangles on the same base with same area?
131919
Vertices of equilateral triangle inscribed in the unit circle
57184
Find the point in a triangle minimizing the sum of distances to the vertices
96065
Question about sines of angles in an acute triangle
5642
Geometry with Trigonometry
45366
How to calculate the area of a 3D triangle?
111815
Determine angle $x$ using only elementary geometry
145756
Collinearity problem (Newton-Gauss line)
79777
An olympiad Geometry problem involving triangles
27272
Triangle Inequality with Complex Numbers