What is the sum of internal angles of a triangle?
Explanation:
The correct answer is A. 180°.
In geometry, the sum of the internal angles of any triangle is always 180 degrees. A triangle is a three-sided polygon, and regardless of its type—whether equilateral, isosceles, or scalene—the total measure of its three interior angles remains constant. For example, if one angle measures 60° and another measures 70°, the third angle must be 50° so that the total becomes 180°. This fundamental property is widely used in mathematics, engineering, architecture, and design calculations. The other options, such as 90°, 270°, and 360°, do not represent the angle sum of a triangle.
In geometry, the sum of the internal angles of any triangle is always 180 degrees. A triangle is a three-sided polygon, and regardless of its type—whether equilateral, isosceles, or scalene—the total measure of its three interior angles remains constant. For example, if one angle measures 60° and another measures 70°, the third angle must be 50° so that the total becomes 180°. This fundamental property is widely used in mathematics, engineering, architecture, and design calculations. The other options, such as 90°, 270°, and 360°, do not represent the angle sum of a triangle.
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