Pyramid four sides

A regular tetrahedral pyramid has a body height of 38 cm and a wall height of 42 cm. Calculate the surface area of the pyramid; the result is round to square centimeters.

Correct answer:

S =  4285 cm2

Step-by-step explanation:

h=38 cm s=42 cm  h2=s2(a/2)2 a=2 s2h2=2 422382=16 5 cm35.7771 cm  S1=a2=35.77712=1280 cm2 S2=a s/2=35.7771 42/2=336 5 cm2751.3188 cm2  S=S1+4 S2=1280+4 751.3188=4285 cm2

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