Khan Academy
Khan Academy: Geometry: Language and Notation of the Circle
Formally defines a circle and different parts of a circle. Identifies the proper notation for naming different parts of a circle. [11:12]
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]
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: Parts of a Circle
Explore the parts of a circle then test your knowledge with a quiz.
Sophia Learning
Sophia: Solving for Radii and Tangent Segments
Solve for the unknown radii and tangent segments of circles using a theorem. Assess learning with a quiz.
Sophia Learning
Sophia: Terms Relating to Circles
This lesson will define the terms center, diameter, radius, chord, circumference, and pi. Students can watch a video tutorial and then take an online quiz.
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: Circumference and Area of Circles
Understanding the relationship between the radius, diameter, and circumference of a circle.
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.
Sophia Learning
Sophia: Sector Area of a Circle: Lesson 1
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 1 of 8 in the series titled "Sector Area of a 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."
Sophia Learning
Sophia: Sector Area of a Circle: Lesson 7
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 7 of 8 in the series titled "Sector Area of a Circle."
Sophia Learning
Sophia: Sector Area of a Circle: Lesson 8
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 8 of 8 in the series titled "Sector Area of a Circle."