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75 cm is the perimeter of the quadrilateral ABCD.
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as all the chords are equal , so they subtend equal angle s on th center of circle .
thus all the triangles formed by chords are equal or congruent . as all the triangles are congruent so their angles at center are also equal . thus let the angle be ¢
¢°+¢°+¢°=180°
3¢°=180°
¢°=60°
as angle is 60° , so each triangle is equilateral .
thus , radius =15cm
so , perimeter = 15+15+15+30= 75cm
thus all the triangles formed by chords are equal or congruent . as all the triangles are congruent so their angles at center are also equal . thus let the angle be ¢
¢°+¢°+¢°=180°
3¢°=180°
¢°=60°
as angle is 60° , so each triangle is equilateral .
thus , radius =15cm
so , perimeter = 15+15+15+30= 75cm
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