Question 387561
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Hi, 
Right Triangle with hypotenuse = 12cm        
Let x represent length  of side opposite the 30° angle
  sin 30° = opposite/hypotenuse 
  sin 30°  = 1/2
   {{{ 1/2 = x/12cm}}} cross multiply to solve for x
      2x = 12cm
       x = 6cm

 Sides opposite 30°----- 60°-----90° triangle do have a ratio relationship:
                1 :{{{sqrt(3)}}}:2
 That is: knowing this, 6cm would have been a quick response, for ex.