13sin60 = -3.963 radians
= 11.258 degrees
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13 x 60 = 780
13(60 - w)
26 multiplied by 13 is 338
18 multiplied by 13 is 234
Use trigonometry and the sine ratio: sin = opp/hyp and when rearrange hyp*sin = opp 13*sin(60) = 11.25833025 or 11.26 units in length to 2 d.p.