Fill in the missing statements for the following two-column proof.
given: cis the midpoint of ad
4x +9
prove: x=3
statements
reasons
1) c is the midpoint of ad 1) a 2
2) ac a cd
2) b. ?
3) ac=cd
segments have equal length
4 x = x +9
42
5) d. subtraction property of equality
x=3
6) e 2
statements

Determine whether angle-angle-angle (aaa) is a valid means for establishing triangle congruence. if it is a valid criterion, explain why. if it is not valid, use geogebra to create a counterexample demonstrating that it doesn’t work and give an explanation. if you construct a counterexample, take a screenshot of your work, save it, and insert the image in the space below.