I have four equal sides.
My opposite angles are equal but are not right angles.
What am I?

A rhombus is a four-sided shape where all sides have equal length (marked "s"). Also opposite sides are parallel and opposite angles are equal. ... A rhombus is sometimes called a rhomb or a diamond.

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Answer: r=4.5  feetexplanation: radius  r  is half of the diameter  d,⇒r=d2=92=4.5  feetidk i could be wrong