 | Watch Video on Area and Circumference of a Circle Access full lesson containing this video at: http://www.yourteacher.com/geometry/circumferenceofacircle.php Students learn the formulas for the area and circumference of a circle, and the formulas for arc length and the area of a sector of a circle. Students are then asked to solve problems using these formulas. |
 | Watch Video on Circumference of a Circle - Math Help Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/circumference.php Students learn that the circumference of a circle is the distance around the circle, and the formula for the circumference of a circle is 2 times pi times the radius of the circle. Pi is the ratio of the circumference to the radius, which is approximately 22/7 or 3.14. So a circle with a radius of 3 feet has a circumference of 2 times pi times 3, or 6 pi feet. And since pi = 3.14, 6 pi feet can also be written as 6 times 3.14, or 18.84 feet. Finally, note that the radius of a given circle is half the diameter of the circle. So to find the circumference of a circle with a given diameter, first find the radius of the circle by dividing the diameter by 2. |
 | Watch Video on Area of a Circle - Math Help Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/areaofacircle.php Students learn that the formula for the area of a circle is pi times radius squared, so the area of a circle that has a radius of 5 inches is pi times 5 squared, or 25 pi square inches. And since pi = 3.14, 25 pi square inches can also be written as 25 times 3.14, or 78.5 square inches. Note that the radius of a given circle is half the diameter of the circle. So to find the area of a circle with a given diameter, first find the radius of the circle by dividing the diameter by 2. |
 | Perimeter Quarter Circle and Rectangle Problem Perimeter Quarter Cicrle and Rectangle Problem e mail your answer to satmathproblems@yahoo.com to get math score of 700 and above in the New SAT Math section |
 | Circumference of a Circle This video gives severals examples of the process used to find the circumference of a circle. |
 | Circles Radius Diameter & Pi Math Learning Upgrade Learn circumference, radius, pi and more through music! From the Math Upgrade course at learningupgrade.com |
 | Area of Circle This is a video to find the area of circle by an activity method. |
 | Areas of Circles How to find the area of a ring by applying the area of a circle twice. |
 | Watch Video on Tangents and Circles - Geometry Help Access full lesson containing this video at: http://www.yourteacher.com/geometry/tangentline.php Students learn the following theorems related to tangents. If a line is tangent to a circle, then the line is perpendicular to the radius at the point of tangency. If a line is perpendicular to a radius at its outer endpoint, then the line is tangent to the circle. If two tangent segments are drawn to a circle from an external point, then the tangent segments are congruent. Students are then asked to use these theorems to find missing segment lengths and missing angle measures in given figures. Students also learn the definitions of common internal tangents and common external tangents. |
 | geometry 01 area of regular pentagon mgz en tg2.wmv geometry 01 area of regular pentagon mgz en tg2.wmv |
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