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tatiyna
3 years ago
6

HELPPPPP

Mathematics
2 answers:
mart [117]3 years ago
7 0

answer is the first one and the last 2

NNADVOKAT [17]3 years ago
6 0

Answer:

<h2>1, 3 and 4 are true statements.</h2>

Step-by-step explanation:

Notice that the given triangle has all three side different, that means it's an scalene triangle.

Additionally, the triangular inequality states that the sum of two sides of a triangle must be greater than the third side, that is

DE+EF>DF\\DE+DF>EF\\DF+EF>DE

So, the first choice is also correct.

Then, we use thes triangular inequalities to find the third true statement.

We know that DE=4 and EF=9

DE+EF>DF\\4+9>DF\\DF

Also,

DE+DF>EF\\4+DF>9\\DF>9-4\\DF>5

Therefore, 5, which means side DF must be between 5 and 13.

The third true statement is the third option.

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