Seudónimo Seudónimo
  • 12-03-2018
  • Mathematics
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what is the perimeter of the triangle def will give brainlist and 20 etra point

what is the perimeter of the triangle def will give brainlist and 20 etra point class=
what is the perimeter of the triangle def will give brainlist and 20 etra point class=

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choixongdong
choixongdong choixongdong
  • 12-03-2018
 3^2 + 3^2 = 9+ 9 = 18
FE = √18 = 4.2

P = 3 + 3 + 4.2 = 10.2

answer
C . 10.2 units
Answer Link
Idiofyía
Idiofyía Idiofyía
  • 12-03-2018
To solve this, we need to find the length of side FE using the Pythagorean Theorem, a^2 + b^2 = c^2.  Sides FD and DE are both 3 units long.
3^2 + 3^2 = c^2
9 + 9 = c^2
18 = c^2
sqrt18 = sqrtc^2
4.2 ≈ c
Now, we will add all three sides.  4.2 + 3 + 3 = 10.2.  The correct answer is C, 10.2 units.
Answer Link

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