How to Write a Triangle

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Drawing a triangle and writing or "expressing" a triangle are two different things. Learn how to write a triangle with help from a mathematics educator in this free video clip.

Part of the Video Series: Mathematics Lessons
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Video Transcript

Hi. I'm Jimmy Chang and we're here to talk about how to write a triangle. Now the important thing to think about when it comes to a triangle is it's a three-sided closed shape, otherwise known as a three-sided polygon. So, when it comes to writing a triangle you just gotta think about what kind of triangle that you're looking for. There's actually three kinds. The first we're going to talk about is that of a scalene triangle. Now, in a scalene triangle all the angles in the triangle have to be less than 90 degrees. Now, here's an example of one. As you can tell, all the angles are drawn inward so that's an example of a scalene triangle. Now, another triangle that you want to think about is that of a right triangle. Now, a right triangle, as the name implies, is a triangle that contains a right angle which means it's got a 90 degree angle. It's only got one though. One thing I want to emphasize is that a triangle total measure angles equal one 180 degrees so that means all the angles in the triangle equal to one eighty. Now, to indicate a right triangle, more often than not, you indicate a little square that indicates to you that this angle is going to be 90, but this entire triangle equal to 180. And last but not least we have an obtuse triangle which means that this triangle has an obtuse angle which is an angle that's greater than 90 but less than 180 degrees. Now, oftentimes then, you're going to have situation where the angle is going to veer out a little bit, indicating the obtuse nature of that particular angle. But typically, you got three kinds of triangles here scalene, right and obtuse and depending on whichever one fits our scenario you have one to choose from. So, I'm Jimmy Chang and that's how you write a triangle.

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