1
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Let's do this question in the figure BSD is a rhombus, then the value of white minus X is all right.

2
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What's the big deal?

3
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Give it a try and then let's do it together.

4
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All right.

5
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We're back.

6
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Let's do it together.

7
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Let me mark these two angles as angle one and angle to.

8
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All right, now you can see that Y is equal to 90 degree, right, y y 90 degree because the diagonals

9
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of a rhombus bisect each other right now because of the same reason.

10
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Angle two also will be equal to 90 degrees.

11
00:00:35,450 --> 00:00:36,760
And you can see that too.

12
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And why form a linear pair as well.

13
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So angle two also is equal to 90 degrees.

14
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All right.

15
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Now, in this triangle, let me call this all in triangle or maybe you can see that we have 40 degrees.

16
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One angle we have angle to equal to 90 degrees.

17
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Therefore, we can find angle one because 40 plus angle two plus angle one is equal to 180 degrees.

18
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And hence angle one is equal to 50 degrees.

19
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Now, a rhombus is a partial Graham, right.

20
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Therefore, this is parallel to be a..

21
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Is acting as the transversal.

22
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Therefore Angle X is equal to angle one because both of them are alternate interior angles.

23
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And we have found that angle one is equal to 50 degrees, therefore X is equal to 50 degrees.

24
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Now, as per the question, we need to find Y minus X, Y minus X is 90, minus 50.

25
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That's equal to 40 degrees, which is option.