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April 6th, 2018, 06:45 PM  #1 
Senior Member Joined: Aug 2014 From: India Posts: 458 Thanks: 1  What is the full form of LDCT and LTCT in cyclic quadrilateral?
L.D.C.T = $\sqrt {d^2  (Rr^2)}$ L.T.C.T = $\sqrt {d^2  (R+r^2)}$ What is the full form of LDCT and LTCT in cyclic quadrilateral? Last edited by Ganesh Ujwal; April 6th, 2018 at 06:52 PM. 
April 7th, 2018, 06:35 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,931 Thanks: 2207 
Can you provide a diagram?

April 7th, 2018, 12:57 PM  #3 
Global Moderator Joined: May 2007 Posts: 6,807 Thanks: 717 
Enlighten us. What do LDCT and LTCT mean?

April 7th, 2018, 06:03 PM  #4 
Senior Member Joined: Aug 2014 From: India Posts: 458 Thanks: 1 
Length of direct common tangent and length of transverse common tangent. I got it. Last edited by skipjack; April 8th, 2018 at 05:14 AM. 
April 8th, 2018, 05:12 AM  #5 
Global Moderator Joined: Dec 2006 Posts: 20,931 Thanks: 2207 
Perhaps you intended LDCT = $\sqrt{d^2  (R  r)^2}$ and LTCT = $\sqrt{d^2  (R + r)^2}$, as given and proved in this article. However, I don't understand your reference to a cyclic quadrilateral, or what you meant by "full form".


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cyclic, form, full, ldct, ltct, quadrilateral 
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