Q: What is a triangle and what are its types in geometry?

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In Euclidean plane geometry every triangle MUST BE coplanar.

It means 3 angles that can be found in a triangle.

yes

In normal geometry, it's not possible to make a triangle with two obtuse angles. It is possible to make a triangle with two obtuse angles in spherical geometry -- it's a kind of "spherical triangle". It is possible to make a triangle with two obtuse angles in some kinds of non-Euclidean geometry -- it's a kind of "non-Euclidean triangle".

The different types of symmetry in geometry are symmetrical and asymmetrical.

Related questions

There are four different types of triangles. They include the isosceles triangle, equilateral triangle, scalene triangle and obtuse triangle. Triangles are used in geometry.

A right triangle in geometry is a triangle that has 90 degrees as one of its angles.

The altitude of a triangle IS a geometric concept so it intersects geometry in its very existence.

In standard geometry, a triangle with none of its interior angles the same is scalene. Recall those three angles must sum to 180 degrees. Other triangle types include isoceles and equilateral.

No, never in plane geometry.

In geometry, magnitude is the length of the hypotenuse of a right triangle.

He drew a triangle on his geometry test.

It means 3 angles that can be found in a triangle.

In Euclidean plane geometry every triangle MUST BE coplanar.

The longer sides of a triangle

yes

In normal geometry, it's not possible to make a triangle with two obtuse angles. It is possible to make a triangle with two obtuse angles in spherical geometry -- it's a kind of "spherical triangle". It is possible to make a triangle with two obtuse angles in some kinds of non-Euclidean geometry -- it's a kind of "non-Euclidean triangle".