Question

Difference between plane angle and solid angle.
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Answer 1

Solid Angle. ... 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. The dimensionless unit of plane angle is the radian, with 2π radians in a full circle.

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.