Naledi climbed up a mountain. Her initial altitude was 404040 meters above sea level, and it increased by 101010 meters each hour. Let g(n)g(n)g, left parenthesis, n, right parenthesis be Naledi's altitude at the beginning of the n^\text{th}n
th
n, start superscript, start text, t, h, end text, end superscript hour of her climb.
ggg is a sequence. What kind of sequence is it?

Given: ab ≅ cd and ad ≅ bc prove: abcd is a parallelogram. statements reasons 1. ab ≅ cd; ad ≅ bc 1. given 2. ac ≅ ac 2. reflexive property 3. △adc ≅ △cba 3. ? 4. ∠dac ≅ ∠bca; ∠acd ≅ ∠cab 4. cpctc 5. ∠dac and ∠bca are alt. int. ∠s; ∠acd and ∠cab are alt. int. ∠s 5. definition of alternate interior angles 6. ab ∥ cd; ad ∥ bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3? triangle angle sum theorem sas congruency theorem sss congruency theorem cpctc