1.

if the length of a chord is equal to that of the radiusof the circle then the angle subtended in radians at the centre of the circle by chord is

Answer»

If the LENGTH of chord is equal to the RADIUS of CIRCLE, an EQUILATERAL triangle will be formed by joining them.

So, Central angle = 60°

= 60 × pi / 180

=  \frac{\pi}{3}



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