All the angles in ANY triangle [on a plane surface] add up to 180 degrees.
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The angles of all triangles have a sum of 180 degrees.An isoceles triangle has at least 2 equal sides (if all three are equal, it is an equilateral triangle).
The 3 interior angles of a triangle add up to 180 degrees
An Isoceles triangle has two equal sides and two equal angles (though all triangles have three angles)
An isoceles triangle has at least two sides equal; an equilateral has three sides equal so it is also isoceles; and since all angles are acute it is also an acute traingle
The interior angles of a triangle all add up to 180 degrees.