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Rainbow [258]
3 years ago
6

The triangles are similar.

Mathematics
1 answer:
Natalija [7]3 years ago
4 0
X=23

I say this because you can see that the scale factor is 3 due to just visually scaling both the long and short leg from the original triangle to the dilated triangle. Dividing 39 by 3 is 13, and doing it in reverse. Adding 10 would equal 23, the initial value. So that'd be the missing value.
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