A "45-degree" angle is formed when two lines meet at an angle that is exactly halfway between a right angle (90 degrees) and a straight angle (180 degrees). This angle is often represented in geometry and is commonly used in various fields, including architecture and engineering. In practical applications, a 45-degree angle is frequently seen in triangles, particularly in isosceles right triangles, where the two non-right angles are each 45 degrees. It is also used in carpentry for making precise cuts and in design for creating visually appealing layouts.