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6²+x²=y²
x=12-y
36+(12-y)²=y²
x=12-y
36+12²+ y²- 2*12y= y²
x=12-y
36+144+y²-24y=y²
x=12-y
y²- y²-24y=-144-36
x=12-y
-24y=180/:-24
x=12-y
y=7,5
x=12-7,5
y=7,5
x=4,5
y=7,5
odp.świerk został złamany na wysokości 4,5m