Scalene: I have no rules, I'm a scale! Then the other way is based on the measure of the angles of the triangle. So for example, this right over here would be a right triangle. A perfect triangle, I think does not exist. I want to make it a little bit more obvious. E. g, there is a triangle, two sides are 3cm, and one is 2cm.
And let's say that this has side 2, 2, and 2. 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. Maybe this is the wrong video to post this question on, but I'm really curious and I couldn't find any other videos on here that might match this question. An obtuse triangle cannot be a right triangle. Absolutely, you could have a right scalene triangle. Notice, they still add up to 180, or at least they should. Classifying triangles 4th grade. So that is equal to 90 degrees. Now down here, we're going to classify based on angles. Maybe this has length 3, this has length 3, and this has length 2. So for example, this would be an equilateral triangle. And the normal way that this is specified, people wouldn't just do the traditional angle measure and write 90 degrees here.
A reflex angle is an angle measuring greater than 180 degrees but less than 360 degrees. So let's say a triangle like this. Geometry 4-1 practice classifying triangles. And because this triangle has a 90 degree angle, and it could only have one 90 degree angle, this is a right triangle. So by that definition, all equilateral triangles are also isosceles triangles. A reflex angle is equal to more than 180 degrees (by definition), so that means the other two angles will have a negative size.
Isosceles: I am an I (eye) sosceles (Isosceles). And then let's see, let me make sure that this would make sense. Now, you might be asking yourself, hey Sal, can a triangle be multiple of these things. What is a perfect triangle classified as? But not all isosceles triangles are equilateral. All three sides are not the same. Classify triangles 4th grade. But on the other hand, we have an isosceles triangle, and the requirements for that is to have ONLY two sides of equal length. Now an equilateral triangle, you might imagine, and you'd be right, is a triangle where all three sides have the same length. Can it be a right scalene triangle? 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. 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. In fact, all equilateral triangles, because all of the angles are exactly 60 degrees, all equilateral triangles are actually acute.
Answer: Yes, the requirement for an isosceles triangle is to only have TWO sides that are equal. Notice they all add up to 180 degrees. Maybe you could classify that as a perfect triangle! And this right over here would be a 90 degree angle. That's a little bit less. 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. Or if I have a triangle like this where it's 3, 3, and 3. Wouldn't an equilateral triangle be a special case of an isosceles triangle? What type of isosceles triangle can be an equilateral. A right triangle is a triangle that has one angle that is exactly 90 degrees. Why is an equilateral triangle part of an icoseles triangle. An equilateral triangle has all three sides equal?
My weight are always different! A right triangle has to have one angle equal to 90 degrees. And that tells you that this angle right over here is 90 degrees. Created by Sal Khan. That is an isosceles triangle. To remember the names of the scalene, isosceles, and the equilateral triangles, think like this! Would it be a right angle? An equilateral triangle would have all equal sides. But both of these equilateral triangles meet the constraint that at least two of the sides are equal.
An acute triangle is a triangle where all of the angles are less than 90 degrees. I dislike this(5 votes). And a scalene triangle is a triangle where none of the sides are equal. Notice all of the angles are less than 90 degrees. An acute triangle can't be a right triangle, as acute triangles require all angles to be under 90 degrees. I've asked a question similar to that. Equilateral: I'm always equal, I'm always fair! The first way is based on whether or not the triangle has equal sides, or at least a few equal sides. I've heard of it, and @ultrabaymax mentioned it. So let's say that you have a triangle that looks like this. Have a blessed, wonderful day!
An equilateral triangle has 3 equal sides and all equal angle with angle 60 degrees. 25 plus 35 is 60, plus 120, is 180 degrees. And I would say yes, you're absolutely right. Want to join the conversation?
Now an isosceles triangle is a triangle where at least two of the sides have equal lengths. This would be an acute triangle. They would put a little, the edge of a box-looking thing. Equilateral triangles have 3 sides of equal length, meaning that they've already satisfied the conditions for an isosceles triangle. The only requirement for an isosceles triangle is for at minimum 2 sides to be the same length. No, it can't be a right angle because it is not able to make an angle like that.
If this angle is 60 degrees, maybe this one right over here is 59 degrees. A triangle cannot contain a reflex angle because the sum of all angles in a triangle is equal to 180 degrees. An isosceles triangle can have more than 2 sides of the same length, but not less. 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. Any triangle where all three sides have the same length is going to be equilateral. And this is 25 degrees. So for example, this one right over here, this isosceles triangle, clearly not equilateral. It's no an eqaulateral. So there's multiple combinations that you could have between these situations and these situations right over here.
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