Considering the three general types of geometry (flat, spherical, and saddle-shaped), when do the angles in a triangle add to 180°?
A) only in a flat geometry
B) always, regardless of the geometry of space
C) only in a spherical geometry
D) only in a saddle-shaped geometry
E) only if the triangle is an equilateral triangle
A) only in a flat geometry
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What will be an ideal response?