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x+y=25
x=25-y
x²+h²=(√5)²
x²+h²=5
h²=5-x²
y²+h²=20²
y²+h²=400
h²=400-y²
400-y²=5-x²
395-y²=-(25-y)²
395-y²=-(625-50y+y²)
395-y²=-625+50y-y²
50y=1020/:50
y=20,4
x=25-20,4=4.6