Wilma and Betty are playing a number game. Wilma tells Betty, "I'm thinking of a number between 1 and 10. If I take the number a
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Use the law of cosines to find a: 
So to use the given numbers you get:
Which would come out to equal about 35.94
so a=35.9
So to use the given numbers you get:
Which would come out to equal about 35.94
so a=35.9