In classical geometry, a radius (PL: radii) of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the latin radius, meaning ray but also the spoke of a chariot wheel. The plural of radius can be either radii (from the Latin plural) or the conventional English plural radiuses. The typical abbreviation and mathematical variable name for radius is R or r. By extension, the diameter D is defined as twice the radius: If an object does not have a center, the term may refer to its circumradius, the radius of its circumscribed circle or circumscribed sphere. In either case, the radius may be more than half the diameter, which is usually defined as the maximum distance between any two points of the figure. The inradius of a geometric figure is usually the radius of the largest circle or sphere contained in it. The inner radius of a ring, tube or other hollow object is the radius of its cavity. For regular polygons, the radius is the same as its circumradius. The inradius of a regular polygon is also called apothem. In graph theory, the radius of a graph is the minimum over all vertices u of the maximum distance from u to any other vertex of the graph. The radius of the circle with perimeter (circumference) C is (Wikipedia).
playlist at: http://www.youtube.com/view_play_list?p=8E39E839B4C6B1DE https://sites.google.com/site/shaunteaches/ radius and diameter
From playlist Common Core Standards - 6th Grade
Circles and Solids: Radius, Diameter, and Naming Solids
This video explains how to determine the radius and diameter of a circle. Various solids are also named.
From playlist Circles
Circle Terminology - Radius Diameter Sector Segment Chord Arc Tangent | Geometry | Math | FuseSchool
DESCRIPTION: There are some key words we need to know for circles: radius, circumference, diameter, sector, segment, tangent, chord and arc. In this video we discover what they all mean. The radius is the distance from the centre of a circle to a point on the circle. A diameter is the dist
From playlist MATHS: Geometry & Measures
Example: Determine the Area of a Circle
This video provides an example of how to determine the area of a circle when given the diameter. Complete Video List at http://www.mathispower4u.com
From playlist Perimeter and Area
Learn how to determine the volume of a sphere
π Learn how to find the volume and the surface area of a sphere. A sphere is a perfectly round 3-dimensional object. It is an object with the shape of a round ball. The distance from the center of a sphere to any point on its surface is called the radius of the sphere. A sphere has a unifo
From playlist Volume and Surface Area
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
Find the volume of a sphere given the circumference
π Learn how to find the volume and the surface area of a sphere. A sphere is a perfectly round 3-dimensional object. It is an object with the shape of a round ball. The distance from the center of a sphere to any point on its surface is called the radius of the sphere. A sphere has a unifo
From playlist Volume and Surface Area
Circles: Radius, Diameter, Chords, Circumference, and Sectors
Is there anything more aesthetically pleasing than a perfect circle? It may seem like the king of shapes, but it's also arguably the simplest. Define a central point and a radius, and you've got a circle. What else can we say about circles? Let's find out! Watch the whole Mathematics play
From playlist Geometry
JEE Advanced Physics 2022 Paper 1: #1 Stars, Density, Escape Velocity (Mechanics)
Visit http://ilectureonline.com for more math and science lectures! To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 Two spherical stars A and B have densities rohA and rohB, A and B have the same radius, and their masses M(A) and M(B) are related b
From playlist JEE (ADVANCED) 2022 PAPER 1 PHYSICS
Use the area and circumference of a circle to find the radius and diameter.
From playlist Geometry: Circles
AP Calculus AB: Lesson 7.5: Shell Method
Unit 7: Applications of Integration Lesson 5: Shell Method
From playlist AP Calculus AB
Equation of Circle Lines and Tangents | Revision for Maths A-Level or IB
I want to help you achieve the grades you (and I) know you are capable of; these grades are the stepping stone to your future. Even if you don't want to study science or maths further, the grades you get now will open doors in the future. A-Level Maths Courses, FREE revision guide and wor
From playlist A-Level Maths | Revision Playlist
Diameter and Radius of Graphs | Graph Theory
We define the radius of a graph and the diameter of a graph using the eccentricity of vertices. We relate these terms intuitively back to circles and discuss several examples of graph diameter and graph radius. We also introduce a theorem stating the diameter of a graph is bounded between
From playlist Graph Theory
Physics - Modern Physics (17 of 26) The Bohr Atom: Velocity and Radius of the Electron
Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how find the velocity and radius of the electron of the Bohr Atom
From playlist MODERN PHYSICS 2: ATOMIC AND NUCLEAR PHYSICS, PARTICLE PHYSICS
1 range input fancy slider bars
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From playlist CSS variables
How to determine the height of a triangle when given the area
π Learn how to find the area and perimeter of triangles. A triangle is a shape of three sides. The area of a shape is the measure of the portion enclosed by the shape while the perimeter of a shape is the measure of the outline enclosing the shape. The area of a triangle is given by half
From playlist Area and Perimeter
An introduction to the process of finding the volume of a sphere
From playlist Middle School - Worked Examples