1
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Let's do this question, the sides of A, B and C of Cardinal ABCDE are extended two points, B and

2
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Q respectively is angle A, D, Q, that's angle one over here, plus angle CBP.

3
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That's angle two over here.

4
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Equal to angle E plus angle seem give reason was the video.

5
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Give it a try and then let's do it together.

6
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All right.

7
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We're back.

8
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I hope you've given it a try.

9
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Now let me name these angles as angle three and four and five and angle six.

10
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We know that in triangle a DC angle one is equal to angle three plus angle four.

11
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Why is that so it's as per the exterior angle property of a triangle.

12
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Right.

13
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The angle is equal to the sum of the interior.

14
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Opposite angles to angle one is an exterior angle of triangle ADC and the interior opposite angles or

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angle one are angle three and angle four.

16
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Similarly, angle two is equal to angle five plus angle six.

17
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Right.

18
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The reason is the same.

19
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Now if I add angle one, an angle two, that's equal to angle eight plus Anglesey.

20
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Right, because I have to add three, four, five and six.

21
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Three plus five gives me and four plus six gives me C therefore angle one plus angle two will be equal

22
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to angle A plus angle C.