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If the radius is 8cm and the central angle is 70, how do yu workout the chord lenght?
The longest chord in a circle is its diameter and halve of this is its radius.
If the central angle is 70 and the radius is 8cm, how do you find out the chord lenght?
Unless the chord is the diameter, there is no way to measure the radius of the circle. This is because the radius is in no way dependent on chord length since circles have infinite amount of chord lengths.
You can use the cosine rule and the three lengths of the triangle to find the central angle X, (in radians). Then the length of the arc is r*X units.