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CBSE Class 9 Answered

  1. in quad. ABCD . P is the mid pt .of AC . P.T. the ar(ABCD)=ar(BCPD)
  2. ABCD is a parellelogram ,O is a on the side AC. ar(AOB)=ar(AOD).
  3. In cyclic quad.angB-angD 60 deg. ,show that :smaller of those is also 60 d4eg.  
Asked by aninadathoorsridharan | 25 Jan, 2016, 07:08: AM
answered-by-expert Expert Answer
begin mathsize 14px style Q u e s t i o n s space left parenthesis 1 right parenthesis space a n d space left parenthesis 2 right parenthesis space s e e m space t o space b e space i n c o r r e c t. space P l e a s e space c h e c k space a n d space p o s t space o n e space q u e s t i o n space a t space a space t i m e. P r o v i d i n g space t h e space s o l u t i o n space o f space 3 r d space q u e s t i o n colon left parenthesis 3 right parenthesis space W e space h a v e angle B minus angle D equals 60 degree space space space space space space.... left parenthesis 1 right parenthesis S i n c e space A B C D space i s space a space c y c l i c space q u a d r i l a t e r a l comma angle B plus angle D equals 180 degree space space space.... left parenthesis 2 right parenthesis A d d i n g space e q u a t i o n s space left parenthesis 1 right parenthesis space a n d space left parenthesis 2 right parenthesis angle B minus angle D plus angle B plus angle D equals 60 degree plus 180 degree rightwards double arrow 2 angle B equals 240 degree rightwards double arrow angle B equals 120 degree S U b s t i t u t i n g space v a l u e space o f angle B space i n space e q u a t i o n space left parenthesis 2 right parenthesis comma 120 degree plus angle D equals 180 degree rightwards double arrow angle D equals 60 degree space space space space..... left parenthesis p r o v e d right parenthesis end style
Answered by Rashmi Khot | 25 Jan, 2016, 05:42: PM

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