An oblique angle is an angle that is not a right angle, meaning it measures either less than 90 degrees or more than 90 degrees but less than 180 degrees. These angles can be classified as acute (less than 90 degrees) or obtuse (greater than 90 degrees). Oblique angles are commonly found in various geometric shapes and are essential in fields like architecture and engineering. In addition to their geometric significance, oblique angles play a crucial role in trigonometry, where they help in solving problems related to triangles. Understanding oblique angles is important for students studying geometry and trigonometry, as they form the basis for more complex concepts in mathematics.