#43ap Wikipedia picture of the day on January 5, 2019: Circular…

#43ap Wikipedia picture of the day on January 5, 2019:
Circular paraboloid generated by

z
=
−
a
(

x

2

+

y

2

)
,
a
>
0

{\displaystyle z=-a(x^{2}+y^{2}),a>0}

.
Paraboloide circular 02.jpg.

from WordPress https://vladislavkarelin.wordpress.com/2019/01/05/43ap-wikipedia-picture-of-the-day-on-january-5-2019-circular/


https://66.media.tumblr.com/3b6aa89ad0c222b895d1111f0cfbcd0a/tumblr_pku0e1fK3O1xorz76o1_500.jpg