Area of cyclic pentagon
112135
Area formula for cyclic pentagon?
151000
Area of a weird ellipse shape.
101524
Finding the volume enclosed by two surfaces of revolution
118716
If $ABCD$ is a cyclic quadrilateral, then $AC\cdot(AB\cdot BC+CD\cdot DA)=BD\cdot (DA\cdot AB+BC\cdot CD)$
147351
The expected area of a triangle formed by three points randomly chosen from the unit square
78464
Finding out the area of a triangle if the coordinates of the three vertices are given
35629
Trisect a quadrilateral into a $9$-grid; the middle has $1/9$ the area
96686
Determine the area of a regular octagon with vertices on the unit circle
132759
Area of intersection between two circles
39416
The space obtained by identifying the antipodal points of a circle
91053
Simple proof that equilateral triangles have maximum area
26259
Get surface area of a mesh?
122060
Apollonius circle, its radius and center
158117
How many squares fit in a circle?
45366
How to calculate the area of a 3D triangle?
103416
Proving area under curve
144258
How to show a group is cyclic?