KL^2 = KN^2 + LN^2
KL^2 = ((a * LH * LN) / (b * sqrt(LH^2 + LN^2)))^2 + LN^2
KL^2 = (a^2 * LH^2 * LN^2) / (b^2 * (LH^2 + LN^2)) + LN^2
KL^2 = (a^2 * LH^2 * LN^2 + b^2 * LN^4) / (b^2 * (LH^2 + LN^2))
KL = sqrt((a^2 * LH^2 * LN^2 + b^2 * LN^4) / (b^2 * (LH^2 + LN^2)))
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KL^2 = KN^2 + LN^2
KL^2 = ((a * LH * LN) / (b * sqrt(LH^2 + LN^2)))^2 + LN^2
KL^2 = (a^2 * LH^2 * LN^2) / (b^2 * (LH^2 + LN^2)) + LN^2
KL^2 = (a^2 * LH^2 * LN^2 + b^2 * LN^4) / (b^2 * (LH^2 + LN^2))
KL = sqrt((a^2 * LH^2 * LN^2 + b^2 * LN^4) / (b^2 * (LH^2 + LN^2)))