Equal subtended angles at the center means equal chords (Theorem and proof)

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Friends,
This is a Math video. This is our seventh webisode (WB-7) on "Series 10 - Circles".
In this video, we will learn that if two or more angles subtended at the center of a circle are equal, that means the chords (those have subtended the equal angles at the center) are of equal lengths. Then, we will prove this theorem.
This video is suited for class-9 (Class-IX) or grade-9 kids.
Cheers,
Friends at Rising Pearl