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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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
UML Class Diagram Arrows Guide. Brief guide for choosing right type of…, by Paul Rumyancev
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
Generalization
uml - Understanding why the extends arrow points in the opposite direction  - Stack Overflow
PlantUML tips and tricks
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