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It is about a isosceles
Let ABC a isosceles where AB=AC and angle A is 100degree. The bisector of angleACB meets AB at D. If, BC is equal to 2017. Find AD+CD.
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* *** 2b = ** * * ** bisecting angle *** * 20 ***** ***** *** * ** and Angle ADC
= 180 - ******** * ** Let ** =
* = ** since ** ** isosceles ******** cosine rule
****** = *** +a^2
-2a^2 *** *** ****** * 2a^2 -2a^cos ***
2017^2 * 2a^2 *** *** *****
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*** ** /a = *** 100 ****
** * * *** ******* ** substituting
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