The required length of the rectangle is 89 m.
Given that,
The area of a rectangular field is 6942 m. If the width of the field is 78 m, what is its length is to be determined.
<h3>What is the perimeter?</h3>
Perimeter is the measure of the figure on its circumference.
<h3>What is a rectangle?</h3>
The rectangle is 4 sided geometric shape whose opposites are equal in lengths and all angles are about 90°.
The area of the rectangle = length * width
6942 = length * 78
length = 89 m
Thus, the required length of the rectangle is 89 m.
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