Officer Aptitude Rating (OAR) Complete Practice Test 2026

The total degree measure of the angles in a triangle is 180 degrees. This is a fundamental property of triangles in Euclidean geometry, which states that the sum of the interior angles will always equal 180 degrees, regardless of the type of triangle—whether it is scalene, isosceles, or equilateral.

This property can be understood intuitively by considering that a triangle can be formed by connecting three points in a plane. If you were to draw a line extending from one of the triangle's vertices, you would create two angles that, along with the angle at that vertex, complete a straight line, which measures 180 degrees. Therefore, the total amount from all three angles of the triangle must also equal 180 degrees.

Other options reflect the degrees associated with different geometric shapes or concepts. For example, 90 degrees is the measure of a right angle, while 270 degrees and 360 degrees relate to angles in circles, with 360 degrees representing the complete turn around a point. Thus, while they all have significance in geometry, they do not pertain to the angle measures of a triangle.