Why would two triangles with exact same lengths have the exact same 3 angles?
122832
Proof for SSS Congruence?
116223
Show that the angles satisfy $x+y=z$
112896
Construct the triangle with given angle bisectors
158540
Coordinates vs. Geometries: How can we know two coordinate systems describe the same geometry?
118501
Proving the length of a circle's arc is proportional to the size of the angle
69800
Construction of a right triangle
121084
Right triangles and tangent lines
132981
Triangle tangent to 3 Parabolas, finding the common area
63679
Picture/intuitive proof of $\cos(3 \theta) = 4 \cos^3(\theta)-3\cos(\theta)$?
128205
If $A,B,C$ are the angle of a triangle, then show that $\sin A+\sin B-\cos C\le \dfrac3 2$
120444
Trigonometric Triangle Equality
40596
Proving a relation between inradius ,circumradius and exradii in a triangle
111815
Determine angle $x$ using only elementary geometry
138236
What is the sum of the angles of a triangle on Earth orbit?
10772
Equilateral triangle inscribed in a ellipse
154274
How many triangles are there in the picture?
21013
Why are two identical objects not equal to each other?