The area of a rhombus is 65 square units. The length of one diagonal is 13 units. What is the length of the other diagonal?

The area of a rhombus is half the product of its diagonals: A = (d₁ × d₂) ÷ 2. Substituting the known values gives 65 = (13 × d₂) ÷ 2, so d₂ = 130 ÷ 13 = 10. The other diagonal is 10 units, choice B.

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