What is the measure of angle A?
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If I understood coorectly, you're looking for the fourth root of 81. This exercise can be solved by remembering that extracting the fourth root of a number is the same as raising that number to the power of 1/4.
We also need the prime factorization of 81, which is
So, the fourth root of 81 is 81 raised to the power of 1/4, which means
Now, use the property of exponents to convert the expression into