Final answer:
To find the perimeter, we need to add up the three given expressions after factoring them. The factored form of the perimeter expression is 2(a-2ab-28')cm + (a' + 3ab + 36')cm + (36' + ab - 34')cm.
Step-by-step explanation:
To find the perimeter, we need to add up the lengths of the three given expressions. Let's start by factoring out common terms. For the first expression, (2a-4ab-56') cm, we can factor out 2, giving us 2(a-2ab-28') cm. For the second expression, (a' + 3ab + 36') cm, there are no common factors. For the third expression, (36' + ab - 34') cm, there are no common factors as well. Now, we can add up the factored expressions: 2(a-2ab-28') cm + (a' + 3ab + 36') cm + (36' + ab - 34') cm. We can simplify this further, but the answer in factored form would be:
2(a-2ab-28')cm + (a' + 3ab + 36')cm + (36' + ab - 34')cm