A simple euclidean geometry problem of angles of a triangle using linear equations
40919
Finding an angle within an 80-80-20 isosceles triangle
155636
Cross product of two vectors, given magnitudes and angle
62126
Constructing a triangle given 2 sides and the inscribed circle's radius
134652
Prove that the perpendicular bisectors of the sides of a triangle meet at a point
158727
Leg bisectors in a trapezoid and angle equality
77435
Analytic solution for angle of minimum deviation?
129002
Number of triangles formed by $m$ lines
21745
Proof of Heron's Formula for the area of a triangle
59754
Extended Euclidean Algorithm: backward vs. forward
21875
Find a point on a rotated rectangle with known angle
94638
Solving for three unknowns given three linear equations
90708
Comparing angles and working out the difference
42852
The legs of a right triangle with given hypotenuse and radius of inscribed circle
78464
Finding out the area of a triangle if the coordinates of the three vertices are given
70400
Extracting angles from a simple picture
84334
How to prove the Pythagoras theorem using vectors
61343
Prove that if $\alpha, \beta, \gamma$ are angles in triangle, then $(tan(\frac{\alpha}{2}))^2+(tan(\frac{\beta}{2}))^2+(tan(\frac{\gamma}{2}))^2\geq1$