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