Answer :

a would equal 16.4924 or square root of 272
texaschic101
a^2 + b^2= c^2
a^2 + 13^2 = 21^2
a^2 + 169 = 441
a^2 = 441 - 169
a^2 = 272
a = sqrt 272
a = 16.492 rounds to 16.5

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