



 
Hi Ron, It depends on which side is the base. If the side opposite the 30 degree angle in a 306090 triangle has length 1 unit then the hypotenuse has length 2 units and the third side has length √3 units. Since any other 36090 triangle is similar to this one the ratio of the side measurements remains the same. Thus if a 306090 triangle has the side opposite the 30 degree angle of length 17.2 metres then the hypotenuse has length 2 × 17.2 = 34.4 metres and the third side of length √3 × 17.2 = 29.8 metres. Likewise if a 306090 triangle has the side opposite the 60 degree angle of length 17.2 metres then the side opposite the 60 degree angle has length 17.2/√3 = 9.9 metres and the hypotenuse has length 2 × 9.93 = 19.9 metres. I hope this helps,  


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