The proof that δabc ≅ δcda is shown.

given: ∥ line segment a b is parallel to line segment c d and line segment b c is parallel to line segment d a ∥
prove: δabc ≅ δcda
what is the missing reason in the proof?
perpendicular bisector theorem
pythagorean theorem
hl theorem
sss congruence theorem

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

At a kentucky friend chicken, a survey showed 2/3 of all people preferred skinless chicken over the regular chicken. if 2,400 people responded to the survey, how many people preferred regular chicken?

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.