Flipped Math
Unit 9 Review: Area of Polygons
It's time to show what you know! Individuals first review finding the area of polygons using the formulas from parallelograms to regular polygons. They then brush up on finding the area and circumference of circles, as well as reviewing...
Flipped Math
Sectors and Segments
It's a piece of pizza! Pupils learn about a sector of a circle as a slice of the circle and determine how to find its area. Scholars continue to find out how to calculate the segment of a circle based on the sector's area. At the end,...
Flipped Math
Circles and Arc Lengths
Discuss all things round and round. Pupils review finding area and the circumference of circles and use them to solve problems. Next, they learn about central angles and their relationships to measures of arcs. Learners then find out how...
Corbett Maths
Area of a Sector
It's the skill where fractions and circles must work together. A thorough lesson models the process of finding the area of a sector using a radius and angle. The narrator extends instruction to include finding a radius of a circle from a...
CK-12 Foundation
Calculating Areas of Sectors and Segments: Lesson
Find a slice of pi. The presentation talks through the process of finding the area of sectors and segments of circles. While working examples, the installment of an extensive geometry playlist uses the process to show the formulas for...
CK-12 Foundation
Measuring Arc Length: Lesson
Slice off a piece of pi! A section of an extensive playlist on geometry develops the formula to find the length of an arc. Using the formula, the presentation works through examples finding the arc length, the radius, and the measure of...
CK-12 Foundation
Arcs in Circles: Lesson
Taking a major look at arcs is not minor. A segment of an extensive playlist on geometry introduces the concept of an arc in a circle. The resource demonstrates how to find the measure of an arc and defines special types of arcs.
Krista King Math
Arc Length
Don't let your classes feel like they are going in circles. The video lesson shows pupils how to apply a formula to finding the length of an arc defined along a circle. The instructor uses three different examples to illustrate the...
Brightstorm
Radian Measure of Angles - Concept
An informative lesson begins with a concept video explaining how radians are figured. Then it offers videos of four progressively difficult guided practice problems.
Brightstorm
Radian Measure of Angles
Degrees are not the only way to measure an angle! The third lesson in a four-part series introduces the definition of a radian. The problem videos use the definition to solve problems including converting between degrees and...
Corbett Maths
Area of a Segment
It's not a sector, it's not a triangle, it's just a segment. Viewers of a short YouTube video learn how to calculate the area of a segment. They see how to determine the area of the sector and then subtract off the area of a triangle to...
Corbett Maths
Arc Length
There's no need to go to great lengths to learn about circles. Young mathematicians view a short YouTube video on how to find arc lengths of circles. The video covers a few examples highlighting the method of determining arc length in...
Khan Academy
Khan Academy: Geometry: Problem Involving Angle Derived From Square and Circle
Demonstrates how to solve a challenging geometry problem about finding the measure of an angle that is formed by different segments in a square which intersect with part of a circle. Solution depends on creating triangles in the diagram...
Khan Academy
Khan Academy: Geometry: Area of Inscribed Equilateral Triangle (Basic Trig Used)
Demonstrates how to find the area of an equilateral triangle inscribed in a circle by applying the area formula for a circle and Heron's formula. Some basic trigonometry (SOHCAHTOA) is also used. [11:38]
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: Inscribed and Central Angles
Proof that the measure of an inscribed angle is half the measure of a central angle when the angles intercept the same arc. [14:16]
Sophia Learning
Sophia: Finding the Area of a Sector Using the Central Angle: Lesson 3
This lesson explains how the central angle can be used to determine the area of a sector. It is 3 of 5 in the series titled "Finding the Area of a Sector Using the Central Angle." [8:03]
Sophia Learning
Sophia: Finding the Area of a Sector Using the Central Angle: Lesson 4
This lesson explains how the central angle can be used to determine the area of a sector. It is 4 of 5 in the series titled "Finding the Area of a Sector Using the Central Angle." [4:53]
Sophia Learning
Sophia: Finding the Area of a Sector Using the Central Angle: Lesson 1
This lesson explains how the central angle can be used to determine the area of a sector. It is 1 of 5 in the series titled "Finding the Area of a Sector Using the Central Angle." [2:53]
Khan Academy
Khan Academy: Trigonometry: Radians: Example: Radian Measure and Arc Length
This video shows an example that thinks about the relationship between an arc length and the angle that is subtended by the arc. [3:29]
Virtual Nerd
Virtual Nerd: Find the Circumference of a Circle if You Know the Diameter
It's easy to find the circumference of a circle if you know the diameter. Just plug in its value into the formula for the circumference of a circle to get the answer. This tutorial shows you how. [3:28]
Virtual Nerd
Virtual Nerd: Find the Circumference of a Circle if You Know the Radius
It's easy to find the circumference of a circle if you know the radius. Just plug the value for the radius into the formula and solve. This tutorial shows you how. [4:18]
Virtual Nerd
Virtual Nerd: Find the Radius of a Circle if You Know the Circumference
Use the formula for the circumference of a circle to find the radius. This tutorial shows you how to use that formula and the given value for the circumference to find the radius. [3:43]
Virtual Nerd
Virtual Nerd: How Do You Find the Radius of a Circle if You Know the Area?
You can use the formula for the area of a circle to find the radius. This tutorial shows you how to use that formula and the given value for the area to find the radius. [3:28]