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Geometry Tutorials
This video is for the redesigned SAT which is for you if you are taking the SAT in March 2016 and beyond.
How to find the length of a line segment in a circle?
Circle Theorem - Basic Example
The sector of a circle shown above has center at point 0. The radius of the circle is, 5, and the length of the chord AB is 6. Line segment CO is perpendicular to line segment AB. What is the length, l, of the line segment CO?
(You could answer this question quicker if you could remember the Circle Theorem: A radius that is perpendicular to a chord bisects the chord.)
Try out our new and fun Fraction Concoction Game.
Add and subtract fractions to make exciting fraction concoctions following a recipe. There are four levels of difficulty: Easy, medium, hard and insane. Practice the basics of fraction addition and subtraction or challenge yourself with the insane level.
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