The length of the shadow of a vertical tower increases by 9 m on horizontal ground when the height of the sun changes from 45° to 30 ° , then find the height of the tower?
AB = 9 m DC = h, BC = x In ∆BCD tan 45 ° = DC/BC = h/x 1 = h/x x = h In ∆ACD tan 30° = DC/AC = DC/(AB + BC) 1/ √3 = h/(9 + x) 1/ √3 = h/(9 + h) 9 + h = √3 h √3 h - h = 9 h ( √3 - 1 ) = 9 h = 9/( √3 - 1)x ( √3 + 1)/ ( √3 + 1) = 9( √3 + 1)/2
Identify the number, which when added to itself 17 times gives 756.
 What is related to Menu as Syllabus is related to Course?
72 : 90 :: 240 : ?
Black : Sorrow ∷ Red : ?
Select the option that is related to fourth number in the same way as the first number is related to the second number and the fifth number is related t...
Select the option that is related to the third term in the same way as the second term is related to first term and the sixth term is related to the fif...
Thick : Thin :: Idle : _________
Select the option that is related to fourth number in the same way as the first number is related to the second number and the fifth number is related t...
In the following question, four number pairs are given. In each pair the number on left side of (–) is related to the number of the right side of (â€...
74 : 56 Â :: Â 95 : Â ?