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yogesh_kkk
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Please explain the DS in attached document 
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- Doubt.doc
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1.
Using both (1) and (2):
You can start by giving letters to each angle.
Angle RQS = angle RSQ = c
Angle TSU = angle TUS = d
We know that (x+c+d) = 180
We also know that angle PRT + PTR =90
But PRT = 180 - 2c and PTR = 180 - 2d
So, 180 - 2c + 180 - 2d = 90
Therefore, d + c = 135 and x = 180 - 135 = 45
Choose(c).
2.
Using both (1) and (2):
Xi = Xi - 1 / 2 for i > 1
So, X2 = X1 / 2 or X1 = 2 * X2 and
X3 = X2 / 2 or X2 = 2 * X3 and
X4 = X3 / 2 or X3 = 2 * X4 and
X5 = X4 / 2 .......... (I)
but from (2) X5 = X4 / X4 + 1 ........... (II)
From (I) and (II)
X4 + 1 = 2 therefore, X4 = 1
therefore X3 = 2, X2 = 4 and X1 = 8
Choose(c).
