Now you could imagine an obtuse triangle, based on the idea that an obtuse angle is larger than 90 degrees, an obtuse triangle is a triangle that has one angle that is larger than 90 degrees. Now, you might be asking yourself, hey Sal, can a triangle be multiple of these things. 4-1 classifying triangles answer key of life. What is a perfect triangle classified as? A right triangle has to have one angle equal to 90 degrees. Want to join the conversation?
An isosceles triangle can not be an equilateral because equilateral have all sides the same, but isosceles only has two the same. And then let's see, let me make sure that this would make sense. In this situation right over here, actually a 3, 4, 5 triangle, a triangle that has lengths of 3, 4, and 5 actually is a right triangle. Classifying triangles 4th grade. Learn to categorize triangles as scalene, isosceles, equilateral, acute, right, or obtuse. An equilateral triangle would have all equal sides. Or if I have a triangle like this where it's 3, 3, and 3. I've asked a question similar to that. And this is 25 degrees. And the normal way that this is specified, people wouldn't just do the traditional angle measure and write 90 degrees here.
An equilateral triangle has 3 equal sides and all equal angle with angle 60 degrees. So for example, this right over here would be a right triangle. But both of these equilateral triangles meet the constraint that at least two of the sides are equal. They would put a little, the edge of a box-looking thing. Would it be a right angle? Can an obtuse angle be a right. E. g, there is a triangle, two sides are 3cm, and one is 2cm. Notice all of the angles are less than 90 degrees. 4-1 classifying triangles answer key figures. The first way is based on whether or not the triangle has equal sides, or at least a few equal sides. So for example, if I have a triangle like this, where this side has length 3, this side has length 4, and this side has length 5, then this is going to be a scalene triangle.
I've heard of it, and @ultrabaymax mentioned it. No, it can't be a right angle because it is not able to make an angle like that. An isosceles triangle can have more than 2 sides of the same length, but not less. Isosceles: I am an I (eye) sosceles (Isosceles). So for example, this would be an equilateral triangle. I want to make it a little bit more obvious. So the first categorization right here, and all of these are based on whether or not the triangle has equal sides, is scalene.
Created by Sal Khan. An obtuse triangle cannot be a right triangle. Notice, they still add up to 180, or at least they should. Now an equilateral triangle, you might imagine, and you'd be right, is a triangle where all three sides have the same length. Are all triangles 180 degrees, if they are acute or obtuse? But on the other hand, we have an isosceles triangle, and the requirements for that is to have ONLY two sides of equal length. Then the other way is based on the measure of the angles of the triangle. Now an isosceles triangle is a triangle where at least two of the sides have equal lengths. Or maybe that is 35 degrees. Scalene: I have no rules, I'm a scale! All three of a triangle's angles always equal to 180 degrees, so, because 180-90=90, the remaining two angles of a right triangle must add up to 90, and therefore neither of those individual angles can be over 90 degrees, which is required for an obtuse triangle. So by that definition, all equilateral triangles are also isosceles triangles.
All three sides are not the same. So let's say that you have a triangle that looks like this. Can it be a right scalene triangle? If this angle is 60 degrees, maybe this one right over here is 59 degrees. An equilateral triangle has all three sides equal, so it meets the constraints for an isosceles. Maybe you could classify that as a perfect triangle! So for example, a triangle like this-- maybe this is 60, let me draw a little bit bigger so I can draw the angle measures. And this right over here would be a 90 degree angle. But the important point here is that we have an angle that is a larger, that is greater, than 90 degrees.
A triangle cannot contain a reflex angle because the sum of all angles in a triangle is equal to 180 degrees. A reflex angle is equal to more than 180 degrees (by definition), so that means the other two angles will have a negative size. Can a acute be a right to. Any triangle where all three sides have the same length is going to be equilateral. An acute triangle is a triangle where all of the angles are less than 90 degrees. That is an isosceles triangle. What type of isosceles triangle can be an equilateral. Answer: Yes, the requirement for an isosceles triangle is to only have TWO sides that are equal. Maybe this angle or this angle is one that's 90 degrees. An equilateral triangle has all three sides equal? What is a reflex angle? And because this triangle has a 90 degree angle, and it could only have one 90 degree angle, this is a right triangle. Now down here, we're going to classify based on angles. So for example, this one right over here, this isosceles triangle, clearly not equilateral.
To remember the names of the scalene, isosceles, and the equilateral triangles, think like this! Wouldn't an equilateral triangle be a special case of an isosceles triangle? An acute triangle can't be a right triangle, as acute triangles require all angles to be under 90 degrees. Now you might say, well Sal, didn't you just say that an isosceles triangle is a triangle has at least two sides being equal. And a scalene triangle is a triangle where none of the sides are equal. This would be an acute triangle. So it meets the constraint of at least two of the three sides are have the same length. But not all isosceles triangles are equilateral. Equilateral: I'm always equal, I'm always fair! My weight are always different! Why is an equilateral triangle part of an icoseles triangle.
They would draw the angle like this. That's a little bit less. And that tells you that this angle right over here is 90 degrees. I dislike this(5 votes). What I want to do in this video is talk about the two main ways that triangles are categorized. Notice they all add up to 180 degrees. And let's say that this has side 2, 2, and 2. 25 plus 35 is 60, plus 120, is 180 degrees.
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