Area of the incircle of a triangle (shortcut & proof)
8:47
Inscribed angle theorem (example and proof)
6:38
Finding the area of the circumcircle of a triangle
17:47
Heron's formula (example and proof)
10:37
Heron's Formula Proof (the area of a triangle when you know all three sides)
10:55
Can we NOT solve x^4+64=0 like this?
8:32
this technique is BEAUTIFUL.
6:11
Trigonometric functional equation: If f(sin(2x))=tan(x), then f(x)=?
13:19