Question

what is plane angle and solid angle ?​

Answer 1

Answer:

Angle, plane or solid, is a fundamental quantity of the universe in the same way as mass, length and time, hence it doesn't have any exact definition.

On a plane what a curve subtends on a point with the help of straight lines is an angle.

In three dimensions what a surface subtends on a point with the help of surfaces like cones and straight lines is a solid angle.

What an angle is in two dimensions, solid angle is in three dimensions

Explanation:

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Answer 2

Explanation:

plane angle has a basic unit radian and radian is defined as the plane angle subtended at the center of a circle by an arc equal in length to the radius of a circle.

radian = Arc/ radius.

2) Solid angle has basic unit steradians. Which can be defined as the solid angle subtended at the centre of a sphere by a surface by sphere equal in area to that of a square, having each side equal to the radius of the sphere.

steradians = surface area/ radius × radius