A fence borders a rectangular piece of land. The land has an area of 11,250 square feet and a width of 90 feet. Fencing costs $2 per foot. What is the cost of
the fence?

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Ihave a triangle with a 60 degree angle. lets use d for that angle. what are the values of e and f if d is 60 degrees? and what do you notice about the values of e and f?

State one method by which you can recognize a perfect square trinomial.