The three interior angles of a plane triangle add up to 180 degrees, or pi radians.
If the sum is not 180° you are not in Euclidean space.
If the three angles of a triangle add up to more than 180° then you are in a spherical space, if the sum is less than 180° it is a hyperbolic space.
Example:Think of a triangle on the Earth with one corner at the North Pole, the other corners on the Equator 90° apart (say at 0° [west of Nigeria in Africa] the other at 90° W [West of Ecuador in South America]).Each of these angles is 90° so the sum is 270° -
The surface area of the triangle is one eighth of the surface of the globe. But it is a triangle (on a sphere)!
On a plane, always 180 degrees. If the sum is not 180° you are not in Euclidean (flat) space.
If the three angles of a triangle add up to more than 180° then you are in a spherical space, if the sum is less than 180° it is a hyperbolic space.
Example:Think of a triangle on the Earth with one corner at the North Pole, the other corners on the Equator 90° apart (say at 0° [west of Nigeria in Africa] the other at 90° W [West of Ecuador in South America]).
Each of these angles is 90° so the sum is 270° -
The surface area of the triangle is one eighth of the surface of the globe. But it is a triangle (on a sphere)!
The sum of the internal angles of any triangle is 180 degrees.
Triangles always have 3 sides. The interior angles add up to 180 degrees.
The sum of the interior angles of an obtuse triangle as with all triangles is 180 degrees.
180 degrees
180
The sides can add up to any number. The angles, however, always add up to 180o.
All triangles have 3 sides and 3 inside angles that add up to 180 degrees
A triangle has 3 sides and 3 inside angle that add up to 180 degrees
you add up the measures of the sides Perimeter=a+b+cAdd up the three sides together
180
Add up the three sides.
gin
A triangle has 3 sides and 3 vertices with 3 interior angles that add up to 180 degrees
A triangle has 3 sides, 3 vertices and 3 interior angles that add up to 180 degrees.
i believe 160
It is square because when you add it up then you subract and add triangle then you calulate the sides and get triangle
A triangle has 3 sides and 3 inside angles that add up to 180 degrees. If you are asking about physical dimensions, a triangle is a two-dimensional shape.