Drawing an Isosceles Obtuse Triangle: A Step-by-Step Guide

This article is a summary of the YouTube video ‘How to draw an isosceles obtuse triangle. Construct an isosceles obtuse triangle. @SHSIRCLASSES’ by SH SIR CLASSES

Written by: Recapz Bot

Written by: Recapz Bot

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How does it work?
The video demonstrates drawing an easy isosceles obtuse angle triangle.

Key Insights

  • The video demonstrates how to draw an isosceles obtuse angle triangle in an easy way.
  • The first step is to draw a line segment of any length.
  • Points B and C are marked on the line segment.
  • Two equal angles are drawn at points B and C using a compass.
  • The angles are constructed by drawing arcs with the same radius as the length chosen on points B and C.
  • The lines intersect at point A, forming an obtuse angle triangle.
  • The angle at point A is measured to be 120 degrees using a protector.
  • The triangle meets the criteria for an isosceles obtuse angle triangle because the angles at points B and C are equal, and the sides AB and AC are also equal.
  • The reasons for the classification of the triangle are listed: the sides AB and AC are equal, angle BAC is 120 degrees (greater than 90 degrees), and angles ABC and ACB are both 30 degrees (accurate angles).
  • The video concludes by encouraging viewers to share it with their friends.

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Transcript

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.

This article is a summary of the YouTube video ‘How to draw an isosceles obtuse triangle. Construct an isosceles obtuse triangle. @SHSIRCLASSES’ by SH SIR CLASSES