Area = , where: , and h = height

 ------- Substituting 45 for area; and 5 for h (height)

 ---------- Dividing numerators by 5

 ----------- Cross-multiplying



Since one leg is  the sum of the bases, then we can say that one leg (L) = 

 ------- Substituting 18 for 

L, or one of the legs = 12 units



Perimeter of isosceles trapezoid:  = 18 + 2(12), or 18 + 24, or  

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