Question

An observer at a point on the level ground fine set the angle of ellusion of the top of theatres is 45 degrees on walking 20 m directed towards the tower he finds the angle of elevation is 60 degrees find the height of the tower answer?

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If tanA =√2-1,prove that tanA/1+tan^2A=√2/4

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marks obtained, out of 100, by the students giving in the frequency table given below:-

 marks obtained
 0-34 
35-50
 51-70 
71-90 
91-100 

number of students 8
 9 14 
11 
8

 1) find the probability of the students getting less than 34 marks

 2) find the probability of the students get between 71 to 90 marks

 3) find the probability of the students getting more than 70 marks

 4) find the probability of the students less than equal to 50 marks

 class 10th solution chapter 14 probability

FIND THE COMPLEMENT of each of the following angles
(1) 43    (2) 15       (3) 62    (4) 38

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A two digit number is 5 times the sum of its digit and is also equal to 5 more than the product of it digits. find the number 

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If two straight lines intersect each other,proove that the ray opposite to the bisector of one of the angles thus formed bisect the vertically opposite angle 

The mean height of 200 plants (in cm) was 50 cm. Later on it was discovered that the height of two plants were misreed as 92 and 8 instead of 192 and 88 find the correct mean

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