Let's do this question, the sides of A, B and C of Cardinal ABCDE are extended two points, B and
Q respectively is angle A, D, Q, that's angle one over here, plus angle CBP.
That's angle two over here.
Equal to angle E plus angle seem give reason was the video.
Give it a try and then let's do it together.
All right.
We're back.
I hope you've given it a try.
Now let me name these angles as angle three and four and five and angle six.
We know that in triangle a DC angle one is equal to angle three plus angle four.
Why is that so it's as per the exterior angle property of a triangle.
Right.
The angle is equal to the sum of the interior.
Opposite angles to angle one is an exterior angle of triangle ADC and the interior opposite angles or
angle one are angle three and angle four.
Similarly, angle two is equal to angle five plus angle six.
Right.
The reason is the same.
Now if I add angle one, an angle two, that's equal to angle eight plus Anglesey.
Right, because I have to add three, four, five and six.
Three plus five gives me and four plus six gives me C therefore angle one plus angle two will be equal
to angle A plus angle C.