# Tagged Questions

For questions conserning circles. A circle is a curve composed of points in a plane that are at a fixed distance from a fixed point.

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### Find radius of a circle from intersecting chords

Say I have two chords that intersect inside a circle, not at a right angle, and neither is the diameter. It seems to me this is enough information that the circle must be unique, but I can't seem to ...
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### Problems on measure of angles and arcs in a circle diagram

A friend of mine recommended this site. I cannot figure out any of the parts in the problem in the picture click here The line segments AE and DE are not tangent to the circle, so I don't know where ...
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### Same perimeter and area for a circle and an ellipse

For a given circle, is there exist an ellipse with same perimeter and area as to that circle? If not, that is my suspicion, is in three-dimension parallel question: For a given sphere, is there ...
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### Find altitude of equilateral triangle given inscribed circle dimensions and position

I've found myself trying to solve this for my Geometry class where we have to model a basic piece of architecture and find its volume and surface area (very basic). But the structure I chose requires ...
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### What is the relationship between the width, height, and radius of an arc?

What is the relationship between the width ($w$), height ($h$), and radius ($r$) of an arc? Specifically, the relationship in terms of $h$. I know this is a simple question - I'm a hobbyist engineer,...
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### Archimedes Classic Proof for Area of Circle: Love it but can't grasp one aspect…

The proof assumes that:... The perimeter of any CIRCUMSCRIBED regular polygon is GREATER than the circumference of the circle. ie: !http://www.themathpage.com/atrig/Trig_IMG/eval1.gif Is this an ...
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### How do I calculate the height of an arc?

I'm a hobbyist engineer, having one of those moments where my mind goes blank. I know this is a simple problem, but I can't remember how to approach it. I have an arc defined by width and angle. ($w$ ...
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### Number of chords of a circle having natural length

In a circle of radius 17, point p lies on a distance 15 from center.How many distinct chords of this circle passing through p do have a natural length? I tried to use the notion of Power of point ...
A third circle is drawn such that: both $C_1$ and $C_2$ touch internally The centres of $C_1$, $C_2$ and $C_3$ are collinear. Determine the equation of $C_3$ Circle C1 has the ...