To find which right triangle has an unknown leg measure of \( \sqrt{43} \), we can use the Pythagorean theorem, which states that for a right triangle with legs \( a \) and \( b \), and hypotenuse \( c \):
\[ a^2 + b^2 = c^2 \]
Given the possible responses, we will compute the hypotenuse for each pair of legs and check if either of them matches \( 43 \) when one of the legs is \( \sqrt{43} \).
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Legs: 8 and 21 \[ 8^2 + 21^2 = 64 + 441 = 505 \] Hypotenuse \( c = \sqrt{505} \)
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Legs: 12 and 44 \[ 12^2 + 44^2 = 144 + 1936 = 2080 \] Hypotenuse \( c = \sqrt{2080} \)
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Legs: 5 and 90 \[ 5^2 + 90^2 = 25 + 8100 = 8125 \] Hypotenuse \( c = \sqrt{8125} \)
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Legs: 60 and 19 \[ 60^2 + 19^2 = 3600 + 361 = 3961 \] Hypotenuse \( c = \sqrt{3961} \)
Next, we take a look for any potential combinations of these pairs alongside \( \sqrt{43} \). Since we know:
- If \( a = \sqrt{43} \), we check the condition \( b^2 + 43 = c^2 \).
None of the pairs seem to directly include \( \sqrt{43} \) and achieve a solution within the leg limits.
Thus, as none of the provided pairs have factors that suggest \( \sqrt{43} \) could correspond to a right triangle with the legs provided based upon direct sums of squares, it appears there might be additional pairs of coordinates that would exhibit that missing leg. Therefore, the triangle that incorporates \( \sqrt{43} \) in relation to area or properties will either need further evaluation or differing constructed dimensions allowing additional values as those mentioned predominantly illustrate summative measures without paring to known radicals to yield a coherent output.
Thus, the correct conditions and triangle relations need be stated for clarity and directed inquiry, as the pairs provided do not satisfy the direct question requirements thus remedying the established triangle resolution that is unquestionable.