Answer:
3.09m
Explanation:
refer to attached
by Pythagorean theorem,
x² = 2.8² + 1.3²
x² = 7.84 + 1.69
x² = 9.53
x = ±√9.53
x = ±3.09
since diagonal cannot be negative, hence we pick the positive number
x = 3.09m
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