uml - Understanding why the extends arrow points in the opposite direction - Stack Overflow

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In class diagrams I typically see something like ClassA extends ClassB where the arrow head points to ClassA. Example, here. This has always confused me. Why is the arrow head not pointing to ClassB?
uml - Understanding why the extends arrow points in the opposite direction  - Stack Overflow
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uml - Understanding why the extends arrow points in the opposite direction  - Stack Overflow
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uml - Understanding why the extends arrow points in the opposite direction  - Stack Overflow
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uml - Understanding why the extends arrow points in the opposite direction  - Stack Overflow
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