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I need help to solve this
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I need help to solve this

I need help to solve this-example-1
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Explanation:

(6+r)^2 = 81 + r^2

36 + 12r+ r^2 = 81 + r^2

12r = 81-36 = 45

r = 15/4 = 3.75

User Igor Khrol
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