Triangle abc is rotated 45° about point x, resulting in triangle efd. if ef = 4.2 cm, df = 3.6 cm, and de = 4.5 cm, what is cb? cm

Select the correct answer and solve for y

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me

Which is a logical conclusion based on the given information? a. figure abcd is a rhombus by the definition of a rhombus. b. segment ac is congruent to segment dc by cpctc. c. angle acb is congruent to angle adc by the angle-side-angle theorem. d. triangle acd is congruent to triangle cab by the hypotenuse-leg theorem.