00:01
In this given diagram, a quadrilateral abcd is inscribed in a circle.
00:08
So this is the quadilateral abcd which is inscribed in this circle.
00:16
Therefore, this quadrilateral abcd is a cyclic quadrilateral.
00:22
This is a cyclic quadrilateral.
00:27
And we know that the sum of opposite angles of a cyclic quadrilateral, is equal to 180 degrees.
00:38
Now coming to our question here, these two angles, that is angle a and angle c are the opposite angles of this quadilateral.
00:50
Therefore, their sum will be equal to 180 degrees.
00:55
So we can write that angle a plus angle c will be equal to 180 degrees.
01:04
Degrees using this property.
01:08
Now we will substitute the values...