Question

2. What are the differences between plane angle and solid angle.​

Answer 1

Answer:

A solid angle is a 3D angular volume that is defined analogously to the definition of a plane angle in two dimensions. A plane angle, θ, made up of the lines from two points meeting at a vertex, is defined by the arc length of a circle subtended by the lines and by the radius of that circle, as shown below.

Answer 2

plane angle :it usually refers to an angle in 2 dimensional figure like square, triangle, circle, etc..

Solid angle :it refers to an angle in 3 dimensional figure like cube, cuboid, sphere, etc..