00:01
So, in this question, it is given that if, if a and b are the ends of a diameter of a circle, and c is any point in the circle, then we have to prove that angle a, c, b is a right angle triangle triangle, that is a, c, b is equal to 90 degrees, okay? so let us start the proof.
00:18
First let us join this center to, this is the center, so we will join the center to c, okay.
00:27
Now let us name the center to, okay, for our convenience.
00:31
Now see in this triangle oac, oc equal to oa, so angle, this angle will be equal to this angle.
00:40
Similarly, o b equal to oc, because all the radius, so similarly this angle will be equal to this angle.
00:48
Why? because in triangles, same sides of the triangle, same sides, or that is the equal sides, subtend equal angles.
00:57
So, we can say that, let us name this angle x.
01:02
So, what will use this angle? it will also x.
01:05
So if this is y, this is also y.
01:07
Why? because oa is equal to oc and oc is equal to o b.
01:13
Both of them are the radiuses of circle...