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