



 
Hi Sarah, Each of your 5 isosceles triangles has central angle of 360/5 = 72 degrees. Hence by bisecting this angle you get the diagram below. Thus tan(36^{o}) = h/100 and hence you can find h. Stephen has done this in much more generality and developed an expression for the area of any regular polygon. To see what he did go to the Quandaries and Queries page on Math Central and use the Quick Search to search for the term polygon area. Penny  


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