Hi, 

Right Triangle with hypotenuse = 12cm        

Let x represent length  of side opposite the 30° angle

  sin 30° = opposite/hypotenuse 

  sin 30°  = 1/2

    cross multiply to solve for x

      2x = 12cm

       x = 6cm



 Sides opposite 30°----- 60°-----90° triangle do have a ratio relationship:

                1 ::2

 That is: knowing this, 6cm would have been a quick response, for ex.

 

       

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