The question is in the picture, please answer

Step-by-step explanation:

Since sum of all the angles of triangle is 180° therefore according to the given diagram

180° = x° + 2x° + 3x°

180°= 6x°

x° = 30°

AND

m<C = 2×30° = 60°

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.