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  4. The length of the side (in cm ) of an equilateral triangle inscribed in a circle of radius 8 cm is

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Q. The length of the side (in $cm$ ) of an equilateral triangle inscribed in a circle of radius $8 cm$ is

Trigonometry

Solution:

Equal chords subtend equal angles at the centre $\left(2 r \sin 60^{\circ}\right)$.