If a square has a diagonal of length 10, what is its area?

Thank you for asking ! I ' m happy to help you with your question . However , I think there may be a mistake in your question . A square by definition has all sides of equal length , not a diagonal of a specific length . So , the area of a square cannot be calculated based on the length of a diagonal . \n If you meant to ask about a different shape , please let me know and I ' ll do my best to help . </s>