please explain me this paragraph - 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.
please explain with the help of diagrams.

Hi,

Plane angle and solid angle are the units other than seven base units.

Kindly refer the link below.

https://www.meritnation.com/ask-answer/question/i-didnt-understood-what-is-plane-angle-and-solid-angle-pleas/units-and-measurements/5302676

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