Circles defined for a triangle | Compass and straightedge constructions
In geometry, the circumscribed circle or circumcircle of a polygon is a circle that passes through all the vertices of the polygon. The center of this circle is called the circumcenter and its radius is called the circumradius. Not every polygon has a circumscribed circle. A polygon that does have one is called a cyclic polygon, or sometimes a concyclic polygon because its vertices are concyclic. All triangles, all regular simple polygons, all rectangles, all isosceles trapezoids, and all right kites are cyclic. A related notion is the one of a minimum bounding circle, which is the smallest circle that completely contains the polygon within it, if the circle's center is within the polygon. Every polygon has a unique minimum bounding circle, which may be constructed by a linear time algorithm. Even if a polygon has a circumscribed circle, it may be different from its minimum bounding circle. For example, for an obtuse triangle, the minimum bounding circle has the longest side as diameter and does not pass through the opposite vertex. (Wikipedia).
From playlist Miscellaneous
Inscribed Polygons and Circumscribed Polygons, Circles - Geometry
This geometry video tutorial provides a basic review into inscribed polygons and circumscribed polygons with reference to circles. The opposite angles of a quadrilateral inscribed in a circle are supplementary. This video also explains how to solve the walk around problem when a circle i
From playlist Geometry Video Playlist
How to Find the Circumference ( The Distance Around the Outside ) of a Circle
This tutorial explains how to find the circumference of a circle by using the radius or diameter of a circle. Join this channel to get access to perks: https://www.youtube.com/channel/UCn2SbZWi4yTkmPUj5wnbfoA/join :)
From playlist All about Circles
Geometry - Basic Terminology (32 of 34) What does Inscribed and Circumscribed Mean?
Visit http://ilectureonline.com for more math and science lectures! In this video I will describe when are shapes are inscribed and circumscribed. Next video in the Basic Terminology series can be seen at: http://youtu.be/G78Lv-LgvmM
From playlist GEOMETRY 1 - BASIC TERMINOLOGY
How to find the circumcentre (3 of 3: Circles) - AS/Year 12 Mathematics
How to find the centre and equation of a circle given three points on that circle. This is equivalent to asking how to find the circumcentre of a triangle. ❤️ ❤️ ❤️ Support the channel ❤️ ❤️ ❤️ https://www.youtube.com/channel/UCf89Gd0FuNUdWv8FlSS7lqQ/join ** More A-level Circle v
From playlist A-level Mathematics Revision
Area and Circumference of a Circle (Level 6)
Powered by https://www.numerise.com/ Area and Circumference of a Circle (Level 6) www.hegartymaths.com http://www.hegartymaths.com/
From playlist Key Stage 3
How to Find the Circumference (Distance Around the Outside) of a Circle Given a Radius or a Diameter
This tutorial gives a few examples of how to find the circumference of a circle, when given a diameter or a radius. Join this channel to get access to perks: https://www.youtube.com/channel/UCn2SbZWi4yTkmPUj5wnbfoA/join :)
From playlist All about Circles
Approximating Pi with Gregory's Theorem (visual proof for Pi day)
This is an animated visual proof of the Gregory's theorem, which provides a recursive method of finding the areas of the circumscribed 2n-gon and inscribed 2n-gon of a circle given the areas of the inscribed and circumscribed n-gons. As a Pi day treat, we show how to use these formulas to
From playlist Algebra
Area and Circumference of a Circle
"Find the area or circumference of a circle, including simple fractions of circles."
From playlist Shape: Area & Perimeter
Trigonometry X: the Law of Cotangents (and another lovely relation involving cotangents!)
Boy, oh boy this is a longish one. I prove the Law of Cotangents using the incenter of the triangle, after motivating the path with another way one might seek to prove the Law of Sines using the circumcenter of the triangle. After that, I demonstrate an equally lovely relationship betwee
From playlist Trigonometry
Measure of circumscribed angle | Circles | Geometry | Khan Academy
Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/geometry/cc-geometry-circles/central-inscribed-circumscribed/e/central--inscribed--and-circumscribed-angles?utm_source=YT&utm_medium=Desc&utm_campaign=Geometry Watch the next lesson: https://www.
From playlist High School Geometry | High School Math | Khan Academy
Angle Relationships in Circles
Geometry notes involving secants and tangents of circles and finding the measures of the angles they form.
From playlist Geometry
Circumscribed and Inscribed Circles and Polygons
Watch more videos on http://www.brightstorm.com/math/geometry SUBSCRIBE FOR All OUR VIDEOS! https://www.youtube.com/subscription_center?add_user=brightstorm2 VISIT BRIGHTSTORM.com FOR TONS OF VIDEO TUTORIALS AND OTHER FEATURES! http://www.brightstorm.com/ LET'S CONNECT! Facebook ► https
From playlist Geometry
Area of a Circle, the BEST COMPLETE PROOF by Archimedes | Tricky Parts of Calculus, Part 3
I give a complete proof that the area of a circle is pi r^2, or 1/2 C r, where C is the circumference, based on the original proof by Archimedes. I also provide some historical notes and commentary on this proof and other proofs. This is the third episode in a series called Tricky Parts o
From playlist Math
Area circumradius formula proof | AIME | Math for fun and glory | Khan Academy
Proof of the formula relating the area of a triangle to its circumradius. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/math/math-for-fun-and-glory/aime/2003-aime/v/2003-aime-ii-problem-6?utm_source=YT&utm_medium=Desc&utm_campaign=mathforfunandglory Missed the p
From playlist AIME | Math for fun and glory | Khan Academy
GeoGebra, Excel, and a Simple Computation of Pi by 4 | Algebraic Calculus One | Wild Egg
We introduce both GeoGebra and Excel as powerful tools to help us with the Algebraic Calculus, in the context of what is likely the longest standing computational problem in history: coming up with better and better approximations to "pi", what ever that actually is! Here we adopt our sig
From playlist Algebraic Calculus One from Wild Egg
Geometry - Constructions (11 of 15) How to Circumscribe a Circle Around a Triangle
Visit http://ilectureonline.com for more math and science lectures! In this video I will demonstrate how to circumscribe a circle around a triangle. Next video in the Constructions series can be seen at: http://youtu.be/b50jKTH-Smg
From playlist GEOMETRY 2 - CONSTRUCTIONS