What is the sum of the angles in a triangle?

• A. 90 degrees
• B. 180 degrees
• C. 360 degrees
• D. 270 degrees

Answer: (B)

In any triangle, regardless of its type (whether it is scalene, isosceles, or equilateral), the sum of the interior angles is always 180 degrees. This is a fundamental property of triangles in Euclidean geometry.

To understand why, consider that a triangle can be divided into two right triangles by drawing a line from one vertex to the opposite side, effectively creating two angles that together still must contribute to the overall sum of 180 degrees when combined with the third angle of the triangle.

Consequently, if you add each angle of a triangle together, they always total 180 degrees. This property is essential in various applications, including solving problems related to geometry, constructing shapes, and understanding the nature of polygons. The other choices represent sums that do not align with this foundational principle of triangle properties.