E-Math - Properties of Circles - Using External Point and Tangent Perpendicular Radius

E-Math - Properties of Circles - Using External Point and Tangent Perpendicular Radius.

Topic: Geometry

The property "Tangent from External Point" forms an isosceles triangle
between the external point and the two tangents and a third line that
connects the two tangents. If you see an external point in a properties of
circle question, I am 90% sure that you need to use this property. I think
you have to read your question carefully to see if this property is needed.


The short forms I use above ,
"tan from ext point" means "tangent from external point"
"tan $\bot$ radius" means "tangent perpendicular radius".

Please feedback by commenting in this post if you do not get my
explanation. Thanks

Additional Math (A-Maths) and Math (E-Math) Tutor in Woodlands, Chua Chu Kang,
Sembawang, Bukit Panjang, Yishun and Johor Bahru.

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About Unknown

I created this Blog after my students told me that there is very little information about how to solve GCE O Level Math and Additional Math (A-Math) questions on the internet. Even if they manage to find, the solution were for very basic questions. I am a Full-time Math Tutor in Singapore. I tutor mainly in Northern Singapore (Woodlands, Chua Chu Kang, Bukit Panjang, Yishun and Sembawang). I also tutor in Johor Bahru.