Question

What is plane angle d theta

Answer 1

Answer:

plane angle d. (theta) as the ratio of length of arc ds to the radius r. solid angle d(ohm) as the ratio of the intercepted area dA of the spherical surface , described about the apex O as the centre , to the square of its radius r.

Explanation:

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Answer 2

The plane angle (dθ) is the angle of rotation of two intersecting lines that are required to make the two lines overlap.

• dθ can be described as the infinitesimally small change in the angle between 2 intersecting lines that can be computed as the infinitesimally small change in the length of the arc upon the radius R.

        i.e.  dθ = dl/R

• We can integrate Rdθ to find the length of the arc of a circular curve.

Hence, we can say that dθ is the two-dimensional differential angle between two intersecting lines of a plane.

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