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kobusy [5.1K]
3 years ago
12

Don't get this, pls help !!

Mathematics
1 answer:
Hitman42 [59]3 years ago
5 0

Answer:

39

Step-by-step explanation:

These are congruent, one triangle is twice as big as the other. 117/2=54

so we know that one is twice as big as the other.

78/2=?

?=39

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see the attached figure to better understand the problem

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