Let's analyze the equation \(18^2 + b^2 = 30^2\).
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Calculate \(18^2\): \[ 18^2 = 324 \]
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Calculate \(30^2\): \[ 30^2 = 900 \]
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Substitute these values into the equation: \[ 324 + b^2 = 900 \]
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To find \(b^2\), subtract 324 from both sides: \[ b^2 = 900 - 324 = 576 \]
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Now take the square root of both sides to find \(b\): \[ b = \sqrt{576} = 24 \]
Since we have \(b = 24\), the equation confirms that the triangle is indeed a right triangle. The lengths of the legs are 18 and 24, with 30 being the hypotenuse.
Therefore, the correct response is:
The triangle is a right triangle with a missing leg length of 24.