Hi everyone, welcome to Sishare Classes. Today in this video, we will be discussing an important geometrical construction – how to draw an isosceles obtuse angle triangle in an easy way. So please watch the video till the end. Let’s start.

First of all, let us draw a line segment of any length. Like this. Okay.

Now, we’ll be taking point B and point C.

Next, we’ll be drawing two equal angles at point B and C with the help of a compass. So, first, we’ll put the compass on point B and take any length. Then, draw an arc like this.

Next, put the compass here with the same length and cut here. Draw an arc again with the same length.

Now, put the compass here and cut here.

Similarly, we’ll be drawing a 30-degree angle at point C. Put the compass on point C and take any length. Draw an arc like this.

Next, put the compass here with the same length and cut here. Draw an arc again with the same length.

Now, put the compass here and cut here.

Okay, now we’ll be joining these lines. Both lines meet here at a point, let’s call it angle C. This is also a 30-degree angle and meets here at a point.

Let’s take point A.

Now, we’ll measure angle A with the help of a protractor. Put the protractor on point A, and we find that it is perfectly 120 degrees. So angle A is 120 degrees, and this is an obtuse triangle.

Triangle ABC is an isosceles obtuse angle triangle because this angle and this angle are equal. Obviously, this side and this side are also equal.

By this condition, we can say that the triangle ABC is an isosceles obtuse angle triangle.

Now, let’s write down the reasons.

First, here we have two sides AB and AC which are equal, and angle BAC is 120 degrees, which is greater than 90 degrees. We know that an angle is an obtuse angle if it is greater than 90 degrees and less than 180 degrees. So angle BAC is 120 degrees, making it an obtuse angle.

Now, angle ABC and angle ACB are both 30 degrees, so these are two acute angles.

That’s all. Thanks for watching. Please share it with your friends.