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Pls help I have no idea how to do this

Pls help I have no idea how to do this-example-1
User Galet
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y^2+(4.5)^2=8^2\\y^2+20,25=64\\y^2=43,75\\\\x^2=y^2+4^2\\x^2=43,75+16\\x^2=59,75\\x\approx7.7

User Underdoeg
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