I students, welcome to Triangles, let's get started discussing some of the basics of a triangle.
Let's take an example.
Over here we have Triangle, ABC and Triangle is a three sided figure.
So three sides are there.
You have A, B, B, C, and these are the three sides of this triangle.
Remember, the triangle is a three sided polygon.
You cannot have a polygon with two sides.
All right, let's move on.
It has three angles, you can see that the three angles are angle B, C, that's angle E, you can call
it angle E also and you have Angle ABC.
That's Angle B and you have Angle BCA, which is Angle C.
All right.
And this triangle over here has three.
What is this.
That's A, that's B and this is C, these are the three vertices of this triangle.
And how do we know the triangle really know using this shape.
This is Triangle ABC, that's how we call it.
Now we will discuss various interesting properties about triangles so that you'll be able to solve any
question that comes from triangles.
Let's move on.
Over here again, I take a triangle ABC now over here, we know that it has three sites, right?
The side opposite angle, it is denoted with small letter E, the side opposite angle B is denoted with
smaller the B and the side opposite Anglesey is denoted with small little C.
Now remember A, B and C, these are lengths of these sites.
Therefore, length of side B C is denoted as small letter M, length of side AC is denoted with small
letter B and length of side A, B is denoted with small letters.
See?
Now, let me mark these angles as angle one angle to an angle three.
Now, in a triangle, the angle opposite the greater side will be greater.
But for example, over here you can see that A is greater than C, right?
Remember, these are lengths, the A's of greater length than C, but what can we derive out of that
based on this property?
We can see that the angle opposite it, which is that angle that's capital a right or angle one that
will be greater than angle opposite C, which is Anglesey or angle three.
So we can find that angle one will be greater than angle three.