in a triangle ABC,Dis a point on BC such that 9BD=BC,then relation between AB and AD
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ABD is a triangle.
AD² = AB² + (BC² / 81) - 2 AB (BC /9) COS B
AD² ( BC )² 2 ( BC )
---- = 1 + ( ---- ) - ( ------ ) COS B
AB² ( 9 AB ) ( 9 AB )
AD² = AB² + (BC² / 81) - 2 AB (BC /9) COS B
AD² ( BC )² 2 ( BC )
---- = 1 + ( ---- ) - ( ------ ) COS B
AB² ( 9 AB ) ( 9 AB )
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