Answer:
A=616cm²
Step-by-step explanation:
The question says to use

for pi, now that we know that we proceed like normal and do the formula like this.

Answer:
No solutions
Step-by-step explanation:
Isolate the absolute value:
|x−1| + 5 = 2
Subtract 5 from both sides:
|x-1| = -3
Since an absolute value can never be equal to a negative number, there are no solutions.
The one you have highlighted is correct, that is the sign for congruent.
The answer that you are looking for is 2