Question 389532
Two triangles are similar. The lengths of the sides of the smaller triangle are 4, 6, 7. The longest side of the larger triangle is 21. What is the perimeter of the larger triangle?

Since the triangles are congruent
the coressponding sides are congruent.
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Largest side of larger triangle = 21.
this is 3 times the largest side of the smaller triangle.
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The sides of the larger triangle 
4*3 = 12
6*3=18
7*3=21
Total 51 the perimeter
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