Virtual Nerd
Virtual Nerd: What Is Circumference?
The circumference of a circle is the distance around that circle. Take a look at this tutorial to discover the formulas for the circumference of a circle. [4:22]
Khan Academy
Khan Academy: Geometry: Parts of a Circle
Identifies and labels basic parts of a circle: center, diameter, radius, and circumference. This video also appears in the Geometry: Circles strand. [2:01]
Khan Academy
Khan Academy: Geometry: Area, Pythagorean Theorem
This video shows an understanding of the sum of the interior angles of polygons, properties of parallelogram, lateral area of a cone, area of a kite, and circumference of a circle.
Khan Academy
Khan Academy: Perpendicular Bisectors: Area Circumradius Formula Proof
Proof of the formula relating the area of a triangle to its circumradius.
Sophia Learning
Sophia: Formula for the Area of a Sector
Using prior knowledge of a circle to determine the formula for the area of a sector. Complete assessment to check understanding.
Sophia Learning
Sophia: Sector Area of a Circle
This video lesson demonstrates how to find the radius and area of a circle using the area of a sector and a central angle measurement. Students can check their understanding with an assessment.
Khan Academy
Khan Academy: Introduction to Euclidean Geometry: Language of the Circle
In this video student learn formal definition of a circle including tangent and secant lines, diameters, radii, major and minor arcs.
Khan Academy
Khan Academy: Circumference and Area of Circles: Area of a Circle
This video will show you how to solve problems dealing with the area of a circle.
Khan Academy
Khan Academy: Circles: Inscribed and Central Angles
Showing that an inscribed angle is half of a central angle that subtends the same arc.
Study Pug
Study Pug: Angles in a Circle
Video shows how to find an angle inscribed in a circle. [1:58]
Sophia Learning
Sophia: Determining the Coordinate That Corresponds to an Angle
Given an angle of a circle, this lesson shows how to find the coordinates for the corresponding point on the unit circle.
Sophia Learning
Sophia: Determining the Coordinate That Corresponds to an Angle
Given an angle of a circle, this lesson shows how to find the coordinates for the corresponding point on the unit circle.
Sophia Learning
Sophia: Determining the Coordinate That Corresponds to an Angle
Given an angle of a circle, this lesson shows how to find the coordinates for the corresponding point on the unit circle.
Sophia Learning
Sophia: Sector Area of a Circle: Lesson 5
This lesson will demonstrate how to find the area and radius of a circle when given the sector area and central angle measure. It is 5 of 8 in the series titled "Sector Area of a Circle."