OnlineClassroom.in - Angle subtended by an arc at the center

Angle subtended by an arc at the center is twice the angle subtended by the same arc at any point on the remaining part of the circumference

Subject: Math > Geometry > Circle > Angle subtended by an arc at the center

Source: OnlineClassroom.in

Source: GeoGebra,

Angle subtended by an arc or chordThe angle subtended by an arc or chord

Source: Khan Academy, MathGames

Proof :

Angle SUBTENDED at center

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