The half life of a substance is defined as the period of time it takes for the amount of the substance to decay by half .The sequence below shows the amount of a substance that will be left after a certain number of half lives have elapsed 1/2,1/4,1/8

Which of the following would be a correct step in proving that triangle abc is congruent to triangle cda? a. use a protractor to measure the angles and show that all the corresponding angles are equal in measure. this will allow you to prove congruence by aaa. b. show that segment ab is parallel to segment cd and segment ad is parallel to segment cb. this will allow you to prove congruency by asa. c. show that is segment ab is perpendicular to segment ad. this will allow you to prove congruence by sas. d. none of the above.