The ratio of the corresponding sides of 2 similar TRIANGLES is equal to the square root of the ratio of their areas.

Ratio of one of smaller triangle's sides to corresponding side of larger triangle: 

Let the area of the larger triangle be A

With the area of the smaller triangle being 22 sq inches, we get: 

 ------- Reducing 

 ------- Squaring both sides 



Cross-multiplying, we get the area of larger triangle, or:  

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