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Earlier discussion
1 older comment kept for context.
Emmanuel Enwere
The angle is 75°, divide it by 2 we have 37.5
sin 37.5 = x/3.5cm
0.6088 = x/3.5.
So x = 3.5 × 0.6088
x = 2.13 (length of one side of the chord)
Total length is 2.13 × 2 = 4.26