Find the perimeter of the polygon.

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

4 puzzles in 3 hours

step-by-step explanation:

c

step-by-step explanation:

i think because what else can be a sample of every member

sounds & other waves originate from any vibrating object