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Abhishek Mishra asked a question
Subject: Math, asked on on 8/4/18
29.  In the adjoining figure, ABCD is a rectangle.  Its diagonal AC =  15 cm and ∠ACD = α.  If cot α=32 , find the perimeter and area of the rectangle.


30.  Using the measurements given in figure alongside,
(a) find the values of :
(1) sin ϕ (ii) tan θ.
(b) write an expression for AD in terms of θ.
Hint: (b) CD =  5. Draw DE perpendicular to AB, BE = 5, EA = 9.



 
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Lalitha Shree asked a question
Subject: Math, asked on on 16/12/17
in the following figure ,ab=4 cm and ed=3cm and sin x = 3/5 and cos y =12/13 find the length of bd
Q.37. In the following figure, AB = 4 cm and ED = 3 m.


If sin α=35 and cos β=1213 find the length of BD.
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Subject: Math, asked on on 16/12/18
If 12sin theta = 35cos theta, find the value of (sin theta - cos theta)/(sin theta + cos theta) 
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(xxi) If 2y cos θ = xsin θ and 2x sec θ - y cosec θ = 3, then what is the value of x2 + 4y2 ​?
(a) 2                (b) 1                 (c) 0                   (d) None of these.
(xxii) If tan θ + cot θ = 2, then the value of tan θ - cot θ is
(a) 1                (b) 2                 (c) - 1                 (d) None of these.
(xxiii) If 3 cos θ - 4 sin θ = 5, then the value of 3 sin θ + 4 cos θ is
(a) 1                (b)  2                (c) 0                    (d) None of these.
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In the figure(2) given below,triangle ABC is right angled at B and BD is perpendicular to AC.Find
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Q11. If 13 sin  = 5, find the value of 5 sin θ - 2 cos θtan θ
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Subject: Math, asked on on 8/1/18
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​Q12. Without using trigonometrical tables, evaluate :


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         (i) cos θsin 90°-θ+sin θcos 90°-θ=2   
   
   
         (ii) cos θ sin 90°-θ+ sin θ cos 90°-θ =1


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