Answer stat! Due last week. Please show work

Which three lengths could be the lengths of the sides of a triangle? 21 cm, 7 cm, 7 cm 9 cm, 15 cm, 22 cm 13 cm, 5 cm, 18 cm 8 cm, 23 cm, 11 cm

What is the relationship between all triangles that can be drawn given the same three angles

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.