Base times height equals area of a parallelogram
Formula for lateral area of cylinder:
A

Here r=6 units and h=26 units
Put values in formula.

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(rounded to nearest whole number)
Answer: Lateral area of cylinder= 980 square units
Yes, she is correct
1/2 + 1/2 = 1 or 0.5 + 0.5 = 1 so half of a wall plus half of a wall equals one hole wall.
That's as simple as I can put it mathematical reasoning. I hope this helps