Regular 4-sided pyramid

Find the area (surface area) of a regular 4-sided pyramid if its height is 20 m and the wall height is 23 m.

Correct answer:

S =  1560.9191 m2

Step-by-step explanation:

h=20 m h2=23 m  (a/2)2+h2=h22=232=529  a=2 h22h2=2 232202=2 129 m22.7156 m  S1=a2=22.71562=516 m2 S2=2a h2=222.7156 23=23 129 m2261.2298 m2  S=S1+4 S2=516+4 261.2298=1560.9191 m2

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