The Stack Overflow podcast is back! Listen to an interview with our new CEO.

# Questions tagged [angle]

An object formed by two rays joining at a common point, or a measure of rotation. In the latter form, it is commonly in degrees or radians. Please do not use this tag just because an angle is involved in the question/attempt; use it for questions where the main concern is about angles. This tag can also be used alongside (geometry).

247 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
76 views

### Are there two non-congruent quadrilaterals with same sets of sides and angles?

Are there two non-congruent quadrilaterals with same sets of sides and angles? It is relatively easy to construct such pentagons. Trying to construct quadrilaterals allows for seemingly multiple ...
1k views

### Help calculating angles for woodworking

I am working on a wood working project and need to cut some 2 x 2's on an angle in order to form an X inscribed inside a rectangle. Visually here is what I am trying to create: So basically I want to ...
76 views

### Dynamics of Triangle Iterates by angle bisector

I'm attempting to prove what is demonstrated in this Wolfram demo Let $T_0$ be an arbitrary triangle with vertices $A_0,B_0$and $C_0$,and let $T_1$ be the triangle formed by the intersection points ...
83 views

### Is it possible to prove the derivative of sine geometrically without arc length?

There are a great many ways to prove that the derivative of sine is cosine, some of them based on things like the Taylor series definition. I’d like to prove it using only the right-triangle ...
84 views

### What is the spherical equivalent of splitting a circle into n equal segments and calculating their central angles?

So this is easy to calculate in 2 dimensions, if you have a circle represented by 3 points the angle between any two consecutive points and the spheres centre is simply $\frac{2\pi}{n}$. I basically ...
336 views

### How to find rotated top, left of a rectangle given I have top, left and rotation angle

I think this is a simple problem but my Math/Geometry skills are not very good. I am given the top,left coordinates and the height & width of a rectangle as ...
153 views

### Bounding angles in Riemannian triangles with bounded sides

Is it true that angles in Riemannian triangles with bounded sides are uniformly bounded? More precisely, let $M$ be a Riemannian manifold. Given $0<r <s$, is there a number $\delta$ (...
44 views

19 views

### Vehicle weight on a slope?

A vehicle needs to winch in a cable with 1000lbs of pressure/weight. The vehicle weighs 5400lbs How much of a slope must the vehicle park on to achieve 1000lbs of weight to winch in the cable?
59 views

### How to find 2d angles for 3d vectors?

I have three vectors in 3d that originate at a point. If I look at them along a line perpendicular to a plane that intersects two of them, how do I find the angles between those two vectors and the ...
27 views

27 views

### Shopper shelf view point calculation with webcam algorithm

Shelf shopper view point Goal: Find the point in the shelf where the shopper is looking at. Based on head pose angles (x,y,z) and left- and right eye (x,y) angles. (yaw,pitch,roll) Given: Shelf ...
33 views

### Find the angle of a point in relation to a 3d basis …

The question is quite hard to explain so I included a diagram, what I'm trying to do is to solve for the two angles indicated by clouds, in the quickest way possible. As for the vectors, they are 3 ...
69 views

### Angle between two lines/vectors (both magnitude and sign)

Difference in angles for 4 cases Attached figure shows small part of bigger problem. The circle of radius 5 is divided into 4 segments. Midpoints of these segments are marked (e.g. O). From the ...
322 views

22 views

### How are you supposed to find n of an n-sided polygon given part of two interior angles

I need to work out the below question, but I have no idea what to do. I tried researching but the results were assuming that I know the entire interior angle And I'm not even sure if this is a polygon,...
43 views

### Find the smallest number of acute angles which add up to a full angle. Same with obtuse angles.

Find the smallest number of acute angles which add up to a full angle. Same with obtuse angles. I've got this problem, and I tried to solve it, but I don't know if my reasoning is correct, and formal ...
55 views

### Local coordinates and angle function

I'm stuck with this problem: "Let us consider, on the sphere, the local coordinates associated with the differential structure determined by the atlas \$\{(U_1=S^n\setminus\{N\},\varphi_N),(U_2=S^n\...