OASIS FORUM Post by the Golden Rule. GoldTent Oasis is not responsible for content or accuracy of posts. DYODD.

Apologies for the shaky sketch …done with my fingertip

Posted by Alex Valdor @ 14:07 on April 30, 2018  

But I think you can get the idea :

parabola

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Post by the Golden Rule. Oasis not responsible for content/accuracy of posts. DYODD.