Archive
21st of September 2015
Mathematics
Q:

Sumit Roy Rebooted 2nd Edition - ICSE - Class X

Monday, September 21, 2015 at 18:29:PM

A:

L e t space A B space b e space t h e space v e r t i c a l space p o l e space a n d space l e t space h space b e space i t s space h e i g h t. L e t space B D space b e space t h e space s m a l l e r space s h a d o w space w h e n space t h e space a n g l e space i s space 60 degree space a n d space B D equals x C D space b e space t h e space l o n g e r space s h a d o w space a n d space g i v e n space t h a t space C D equals 3 x C o n s i d e r i n g space t h e space r i g h t space t r i a n g l e space A B D comma space w e space h a v e comma tan 60 degree equals fraction numerator A B over denominator B D end fraction rightwards double arrow square root of 3 equals h over x rightwards double arrow x equals fraction numerator h over denominator square root of 3 end fraction.... left parenthesis 1 right parenthesis C o n s i d e r i n g space t h e space r i g h t space t r i a n g l e space A B C comma space w e space h a v e comma tan y equals fraction numerator A B over denominator B C end fraction rightwards double arrow t a n y equals fraction numerator h over denominator 3 x end fraction rightwards double arrow t a n y equals fraction numerator h over denominator 3 cross times fraction numerator h over denominator square root of 3 end fraction end fraction rightwards double arrow t a n y equals fraction numerator 1 over denominator square root of 3 end fraction rightwards double arrow t a n y equals tan 30 degree rightwards double arrow y equals 30 degree space space space space space space space

Monday, September 21, 2015 at 18:57:PM