The sum of three timesthree times a number and 11 more than the number is the same as the difference between negative 17−17 and
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In all geometry problems, drawing a diagram is most helpful.
The half-side lengths are 5 feet and 12 feet.
By the Pythagorean Theorem, the hypothenuse, or side length of the rhombus is therefore
sqrt(5^2+12^2)=sqrt(169)=sqrt(13^2)
= 13 feet.
See diagram below.
