Charlotte Miller

What Is Plane Angle?

Are you curious to know what is plane angle? You have come to the right place as I am going to tell you everything about plane angle in a very simple explanation. Without further discussion let’s begin to know what is plane angle?

In the realm of geometry and mathematics, plane angles serve as fundamental elements, offering a means to measure and understand the inclination or deviation between two intersecting lines or planes. These angles, forming the building blocks of geometric concepts, play a pivotal role in various fields, from architecture to engineering and beyond.

What Is Plane Angle?

  • Geometric Measurement: A plane angle refers to the inclination or divergence between two intersecting lines in a two-dimensional space, typically measured in degrees or radians. It signifies the amount of rotation required to superimpose one line onto another around a common point, known as the vertex.
  • Angular Units: Plane angles are conventionally measured in degrees, with a complete rotation around a point equal to 360 degrees. Radians, another common angular unit, represent the angle subtended by an arc whose length is equal to the radius of the circle.

Classification Of Plane Angles

  • Acute, Obtuse, Right Angles: Based on their measure, plane angles are categorized into various types. An acute angle measures less than 90 degrees, an obtuse angle measures more than 90 degrees but less than 180 degrees, while a right angle measures exactly 90 degrees.
  • Straight and Reflex Angles: A straight angle measures exactly 180 degrees, forming a straight line. On the other hand, a reflex angle exceeds 180 degrees but is less than 360 degrees, extending beyond a straight line.

Geometric Notations And Terminology

  • Vertex and Arms: The point where the two lines intersect to form an angle is known as the vertex. The lines that form the angle are referred to as arms, with the angle denoted by a symbol such as ∠ABC, where B represents the vertex and A and C are points on the arms.
  • Complementary and Supplementary Angles: Complementary angles sum up to 90 degrees, while supplementary angles form a total of 180 degrees when combined.

Practical Applications

  • Engineering and Architecture: Plane angles find extensive use in various technical disciplines, aiding in design, measurements, and calculations related to structures, layouts, and spatial relationships.
  • Navigation and Astronomy: Understanding angles is crucial in navigation for determining directions and positions using tools like compasses and sextants. In astronomy, angles help in celestial observations and calculations.


In the geometric realm, plane angles serve as fundamental elements, facilitating measurements, calculations, and understanding spatial relationships. Their role spans across diverse fields, from mathematics to practical applications in engineering, architecture, navigation, and beyond.

In the tapestry of geometric concepts, plane angles form the cornerstone of measurements, providing a framework to comprehend orientations, directions, and angular relationships in the multifaceted landscape of geometry and mathematics.


What Is The Plane Angle?

A plane angle is defined by two straight lines intersecting at a point. The space between these lines in the plane defined by them is the plane angle. It is measured in radians (2π radians in a circle) or degrees (360 degrees to a circle).

What Is A Plane Vs Solid Angle?

The plane angle is a two-dimensional geometric object on a plane, and the solid angle is a three- dimensional geometric object in a three-dimensional space. They are quantities of different kinds. Comparing the plane angle and the solid angle by size is just like comparing the length and the area.

What Is A Solid Angle 11th Class?

A solid angle is defined as a three-dimensional angle. It is the angle subtended by any part of a spherical surface of unit radius at its center.

What Is A 180 Degree Plane Angle Equal To?

Hence, 180 plane angle = π radian.

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