$\"\"$

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Observe the diagram:

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Consider the angle $\"\"$ .

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Law of Sines for $\"\"$ is : $\"\"$ .

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Consider $\"\"$

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Substitute $\"\"$ and $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ or $\"\"$ .

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$\"\"$ or $\"\"$ .

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$\"\"$

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The sum of angles in triangle is $\"\"$ .

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Sustitute $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$ .

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Sustitute $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$ .

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Consider the distance from the piston $\"\"$ to the the center of the crankshaft $\"\"$ is $\"\"$ .

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Consider $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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Therefore,the distance from the piston $\"\"$ to the the center of the crankshaft $\"\"$ is $\"\"$ or $\"\"$ .

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$\"\"$

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The distance from the piston $\"\"$ to the the center of the crankshaft $\"\"$ is $\"\"$ or $\"\"$ .