Easy, 15 feet. If he dived 12 the first time and three more than his first the second time you just have to add 3 + 12
Answer: 3.160493827
Step-by-step explanation:
I believe all of your answers are correct. But for the last box, I believe your reasoning would just be CPCTC, or corresponding parts of congruent triangles are congruent. At least, that is what my teacher would have said to write. Your teacher may say otherwise.
Hope this helps!