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11.6 Areas of Circles, Sectors & Segments (Lesson)
By AutenMath
A lesson on finding the area of circles, sectors and segments
Area of a Circle (equation derived)
By Big Bang Physics
The equation for the area of a circle is derived with integration.
Formula for Area of a Circle
By Steven Ellis
This video shows that pi is equal to the ratio of the area of a circle to the area of a square when the radius of the circle equals the length of the side of the square. This is a view of pi other than the ratio of the circumference to the diameter.
Area - Area Of A Circle
By mrmaisonet
Once you know what 'radius' and 'area' mean, watch this video to learn how to calculate the area of a circle. Pay attention to the common mistakes, such as using an incorrect order of operations.
Area of inscribed equilateral triangle (some basic trig used) | Circles | Geometry | Khan Academy
By Khan Academy
This video will give you a good feel for what inscribed figures are like. It uses some trigonometry to figure out what the area of an equilateral triangle inscribed in a circle is, given the circle's radius. NOTE: We don't actually need trigonometry to solve this problem. Notice that we can view the equilateral triangle as six identical 30-60-90 triangles, the hypotenuses of which are radii of the circle, then use the 30-60-90 triangle side length ratios to figure out the rest of what we need to know to solve the problem.
Area of inscribed equilateral triangle (some basic trig used) | Circles | Geometry | Khan Academy
By Khan Academy
This video will give you a good feel for what inscribed figures are like. It uses some trigonometry to figure out what the area of an equilateral triangle inscribed in a circle is, given the circle's radius. NOTE: We don't actually need trigonometry to solve this problem. Notice that we can view the equilateral triangle as six identical 30-60-90 triangles, the hypotenuses of which are radii of the circle, then use the 30-60-90 triangle side length ratios to figure out the rest of what we need to know to solve the problem.
CA Geometry: Circle area chords tangent | Worked examples | Geometry | Khan Academy
By Khan Academy
71-75, area, chords, tangents of circles. All Khan Academy content is available for free at www.khanacademy.org
Area of a Circle
By Khan Academy
u07_l2_t3_we3 Area of a Circle. All Khan Academy content is available for free at www.khanacademy.org
Circle: Application: Finding Area and Length of a Race Track
By easymathk12
An oval track is made by erecting semicircles on each end of a 60m by 120m rectangle. Find the length of the track and the area enclosed by the track.
Labeling parts of a circle | Perimeter, area, and volume | Geometry | Khan Academy
By Khan Academy
Learn more: http://www.khanacademy.org/video?v=04N79tItPEA u07_l2_t3_we1 Parts of a Circle Content provided by TheNROCproject.org - (c) Monterey Institute for Technology and Education
Ex: Domain of Composite Function From Graphs
By Mathispower4u
Ex: Domain of Composite Function From Graphs
Area of a circle
By Khan Academy
Learn how the number Pi allows us to relate the radius, diameter, and circumference of a circle.
Area of a circle
By Khan Academy
In this example, we solve for the area of a circle when given the diameter. If you recall, the diameter is the length of a line that runs across the circle and through the center.
Reading Pie Graphs (Circle Graphs) - Khan Academy
By Khan Academy
While pie charts (or circle graphs) are often easy to read they are more difficult to put into percentages since that usually involves fractions. When used to initially teach fractions this process usually is a bit easier. Use the easy to understand video in this learning to explain to students how to read pie charts (circle graphs).
Where Does Wind Come From? Crash Course Geography #8
By Math and Science
Quality Math And Science Videos that feature step-by-step example problems!
How Does Air Temperature Shape a Place? Crash Course Geography #7
By Math and Science
Quality Math And Science Videos that feature step-by-step example problems!
How Do Oceans Circulate? Crash Course Geography #9
By Math and Science
Quality Math And Science Videos that feature step-by-step example problems!