Fourth grade geometry problem
40919
Finding an angle within an 80-80-20 isosceles triangle
64243
How to find a 4D vector perpendicular to 3 other 4D vectors?
158162
Finding the volume of the tetrahedron.
65967
Projective geometry general question
62518
How many rectangles or triangles.
47378
draw $\triangle ABC$ in which $AB=5.5$cm, $\angle C =40^{\circ}$ and $BC-AC=2.5$cm
148009
Mathematical Olympiad Treasures Problem 1.92 how does this relate to geometric sequence
32050
"World's Hardest Easy Geometry Problem"
4505
Number of students in school club : $4$ Circles Venn Diagram Puzzle
150262
A 3rd grade math problem: fill in blanks with numbers to obtain a valid equation
50277
Relationship between cosines of angles in 4 dimensions
58975
How many rectangles can be obtained by joining four of the $12$ vertices of a $12$-sided regular polygon?
25267
The cow in the field problem (intersecting circular areas)
124933
Isometry group question
95979
Trigonometry and algebra question
35629
Trisect a quadrilateral into a $9$-grid; the middle has $1/9$ the area
146820
How to find the length of a line in a tetrahedron