Answer:
Perimeter is 17.07
Step-by-step explanation:
We know that DF = EF = 5 cm, since D and E are the midpoints of AC and AB, both of which are 10 cm in length.
We need to use the Pythagorean theorem to get the length of DE.

So the perimeter of DEF is 5 + 5 + 7.07 = 17.07
Answer:#carry on learning
Mark me as brainliest
hope it's help
The three undefined terms are point, line, and plane. Thus, figure D represents an undefined term as it's a line.
I'm just guessing but maybe expressions
Answer:
x ≤ 2
Step-by-step explanation:
We are given the inequality:

First, get rid of the denominator by multiplying both sides by 2:

Add both sides by 6 then subtract both sides by x:

Then divide both sides by 3:

Therefore, the answer is x ≤ 2