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musiclover10045
because all 3 sides are given for both triangles you can use the SSS theorem
aroberts0827
SSS - Theorem 

All the sides to you in the problem are given to you and no angles. 
The sides also proportioned out to each other by 1/2. 
In other words, the triangle on the right is 1/2 smaller than the one on the left 
good job