Question

What is the perimeter of triangle DEF?




A.
2.4 units


B.
4.2 units


C.
10.2 units


D.
12.2 units

Answer 1

http://lv.k12.com/mediaFiles/Ninth_Grade/Math/Unit17844/Lesson69372/VHS_PA_S2_04_L207_L307_LQ_Q4.gif

Answer 2

you can see that DF=3 and DE=3


The perimeter,
\[3+3+3\sqrt{2}~~~~~~~~~~~->~~~~~~~~~~~~~~~~6+\sqrt{2}\]

there are at least 4 other way to find the hypotenuse of that triangle, but I hope you see what I did.