I have been looking around for a proof by contradiction on $AAS$ congruence in neutral geometry, but can not find any sources on it. Does anyone know how ...

For a simple summation: $$ Z = \sum_{x=1}^X x^n $$ Solve for n. I have googled unsuccessfully and I do not remember this.

Find the equation of the plane containing the point $(1, 3,−2)$ and the line $x = 3 + t$, $y = −2 + 4t$, $z = 1 − 2t$. Don't know where to start?

Examples of places where I see this used: Let * be a binary operation in S and let H be a subset of S... the binary operation on H given by restricting * ...

On a regular chess board (8 by 8 possible positions) we place 8 towers. How many possibilities are there where no tower can beat another tower, i.e no mor...

I've been doing calculations on my own, just messing around, with infinite series and their respective geometries. I don't actually know enough ...

I'm trying to prove the derivative of $\sqrt{x}$ using geometry. So far I've created a square with area $x$ and side lengths $\sqrt{x}$. The der...

In a triangle $ABC$, $\cos A = 3/5$ and $\cos B = 24/25$. Find the value of $\cos C$. Question: Is this even possible since cosine is adjacent over hypote...

Find $\theta$ with $\sec(3\theta/2)=-2$ on the interval $[0, 2\pi]$. I started off with $\cos(3 \theta/2)=-1/2$, thus $3\theta/2 = 2\pi/3$, but I don'...

I have been reading this topic about scaled partial pivoting. And I'm not able to figure out some things like when should we use scaled partial pivot...