Construct a quadrilateral, not a parallelogram, in which pair of opposite angles and a pair of opposite sides are equal.
45913
If a quadrilateral has a pair of equal opposite sides, and a pair of equal opposite angles, then is it necessarily a parallelogram?
69800
Construction of a right triangle
60795
Quadrilateral's area problem
17701
Making an angle of 10 degree and its multiple using compass?
103378
What is a composition of two binary relations geometrically?
83493
Map an arbitrary triangle to the unit square
73001
Mirrored object not symmetrical
9293
Having a plane equation equaled to zero for calculating its angle with another plane
153446
Calculate the components of a unit vector that lies in the xy-plane and makes equal angles with the positive directions of the x- and y-axes
127566
$2AB$ is a perfect square and $A+B$ is not a perfect square
151326
Concurrency of the heights of a tetrahedron with opposite edges perpendicular.
53421
What's the opposite of a cross product?
48339
A triangle with vertices on the sides of a square, with one at a midpoint, cannot be equilateral
141101
Russia (2000) contest:Prove the existence of a pair of rows and columns with intersections differently coloured
105320
How to generate a mesh with quadrilateral elements?
80522
Quaternion rotation without Euler angles
90708
Comparing angles and working out the difference