In Euclidean geometry, 180. Other answers are possible, depending on the surface on which the triangle is drawn.
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ALL triangles - have internal angles that add up to 180 degrees.
Any type of triangle will have angles that add up to 180o. yet two angles of an isosceles triangle are equal
A quadrilateral shape has four sides and four internal angles. A triangle has three sides and three internal angles. Therefore there is no such thing as a quadrilateral triangle.
Sum of angles in a triangle is 180
The angles of a triangle add up to 180 degrees.