An equilateral triangle has 3 sides of equal length ... the angle formed outside the triangle is the exterior angle. \(g\) is the interior angle. \(h\) is the exterior angle.

An equilateral triangle has 3 sides of equal length ... the angle formed outside the triangle is the exterior angle. \(g\) is the interior angle. \(h\) is the exterior angle.

Students may notice symmetry in the isosceles and equilateral triangles and non-symmetry in the scalene triangles Informal recognition of these properties may be helpful in recognizing formal ...