Image is attached, please help! i’ve been stuck for a while.

Which of the following are accepted without proof in a logical system? check all that apply.

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.

Find the center of the circle that can be circumscribed about efg with e(4,4) f(4,2) g(8,2)