Skip Navigation Links
   
Circle: Tangents
To enroll in any of our courses, click here
 
   
Circle: Tangents
A line or line segment that touches the perimeter of a circle at one point only and is perpendicular to the radius that contains the point is called tangent of a circle i.e. it intersects the circle's radius at 90angle.
People who saw this lesson also found the
following lessons useful:
Rational Expression
Similar Triangles (Angles are Congruent)
Greatest Common Divisor
Mean of Finite Numbers
Arithmetic Progression
Example: The string of a kite is 50 meters long and it makes an angle of 60 with the horizontal, find the height of the kite, assuming that there is no slack in the string.
Solution: Let OA be the horizontal ground, and let B be the position of the kite at a height h above the ground. Then, AB = h. It is given that OB = 50 meters and AOB = 60.
In AOB, we have sin 60 = AB/OB
sin 60 = h/100
h = 50 sin 60
h = 50(3/2) = 253 = 43.30 metres
 
   
As many of you know, Winpossible's online courses use a unique teaching method where an instructor explains the concepts in any given area to you in his/her own voice and handwriting, just like you see your teacher explain things to you on a blackboard in your classroom. All our courses include teacher's instruction, practice questions as well as end-of-lesson quizzes for practice. You can enroll in any of our online courses by clicking here.

The format of Winpossible's online courses is also very suitable for teachers who are using an interactive whiteboard such as Smartboard on Promethean in their classrooms, because the course lessons can be easily displayed on such interactive whiteboards. Volume pricing is available for schools interested in our online courses. For more information, please contact us at educators@winpossible.com.

 
       
     
 Copyright © Winpossible, 2010 - 2011
Best viewed in 1024x768 & IE 5.0 or later version