Answer:
Step-by-step explanation:
- AB = DC as opposite sides of rectangle.
- DE = AD as equal sides of isosceles triangle
- DE + EC = DC segment addition postulate
Now substitute the values and find the length of EC:
- EC = AB - AD
- EC = 4p + 3 - (3p - 1)
- EC = 4p + 3 - 3p + 1
- EC = p + 4
Given p = 1
