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Answer garden math

We know that the two trinagles are right-angled triangles so, 2,5² + a² = 4² 6,25 + a² = 16 16 - 6,25 = a² 9,75 = a² a = √9.75 We know that the quadrilateral is a rectangle so the opposite sides have the same length So 8² + a² = 8,5² 16 + a² = 72,25 72.25 -16 = a² a² = 56,25 a =  √56.25

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