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NeTakaya
3 years ago
7

The triangles are similar.

Mathematics
2 answers:
galben [10]3 years ago
8 0
21 21 beacause 7x3 is 21
myrzilka [38]3 years ago
4 0
21 is the value of x. the bigger triangle is three times the size of the smaller rectangle. so you multiply all of the sides of the smaller triangle by 3 to get the sides of the bigger triangle.
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