how to create a spiral truncated pyramid by using plot 3 function?

how to create a spiral truncated pyramid by using plot3 function.
I want to crat a truncated pyramid with top part x=50 and y=50 and the spiral plot will decrease with a step depth of Z=0.5. and a total height will be -40. the angle of inclination of the pyramid will be 45 degrees.
thank you !

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2018 年 9 月 29 日

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