In Exercises 1–6, the measure of an angle is given. Classify the angle as acute, right, obtuse, or straight. 𝜋/2

Key Concepts

Types of Angles

Angles can be classified into four main types based on their measures: acute angles (less than 90°), right angles (exactly 90°), obtuse angles (greater than 90° but less than 180°), and straight angles (exactly 180°). Understanding these classifications is essential for identifying the nature of any given angle.

Radian Measure

Radian is a unit of angular measure used in mathematics. One complete revolution around a circle is 2π radians, which corresponds to 360 degrees. Therefore, π/2 radians is equivalent to 90 degrees, which is classified as a right angle.

Angle Classification Criteria

To classify an angle, one must compare its measure to the standard angle measures. An angle is classified as acute if it is less than 90°, right if it is exactly 90°, obtuse if it is between 90° and 180°, and straight if it is exactly 180°. This systematic approach allows for accurate identification of angles.