Two numbers are said to be If they do not have common factor other than 1.

When two numbers have no common factors other than 1. In other words there is no value that you could divide them both by exactly (without any remainder). Relatively Prime is also called "coprime" or "mutually prime".

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To answer this question, we will first calculate the area of the original piece of paper then we will calculate the are of the rectangle she cut from the corner. Finally, we will subtract these areas to get the area of the remaining part.

1- For the original rectangle paper:
We have the length = 16 cm and the width = 21 cm
Area1 = length x width = 16 x 21 = 336 cm^2

2- For the rectangle cut from the corner:
We have:
length = 16 - 9 = 7 cm
width = 21 - 6 = 15 cm
Area2 = length x width = 7 x 15 = 105 cm^2

The area of the remaining part can be calculated as follows:
area of remaining part = Area1 - Area2 = 336 - 105 = 231 cm^2