MATH Destroyer Test 12, QSN 30

[ammarm]

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Can someone please help me in understanding the qsn 30 from test 12 of math destroyer.. i understand up to the point where the two big corner triangles have an area of 25/4. What i dont understand is how they got the 1:2: 5^(1/2) as the sides of those two small corner triangles. Can someone please help as im stuck at that point not understanding how they got 1:2:5^(1/2) as the dimensions of the two small triangles on the corner in the solutions at the back? Thanks