Answer:
1) 4.58
2) 7.41
3) 9.48
actiivity 2
1: 5.19615242271 or 5.19
2: 9.38083151965 or 9.38
3: 3.60555127546 or 3.6/3.60
4: 1.73205080757 or 1.73
5: 7.21110255093 or 7.21
