Can someone help me with this problem? ​

Answer and Step-by-step explanation:

Answer is in picture.

We use the cosine trig function (adjacent side over hypotenuse = cos of an angle) to find m.

The angles are split perfectly in half, half of 90, which is 45, so the other angles are 45.

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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.

step-by-step explanation:

de-gf

hj=3x+20

ji=15x-64