Tetrahedral pyramid

A regular tetrahedral pyramid is given. Base edge length a = 6.5 cm, side edge s = 7.5 cm. Calculate the volume and the area of its face (side area).

Correct answer:

V =  83.4668 cm3
S =  87.8703 cm2

Step-by-step explanation:

a=6.5 cm s=7.5 cm  S1=a2=6.52=4169=42.25 cm2  u1=2 a=2 6.59.1924 cm  h=s2(u1/2)2=7.52(9.1924/2)25.9266 cm  V=31 S1 h=31 42.25 5.9266=83.4668 cm3
h2=h2+(a/2)2=5.92662+(6.5/2)26.7593 cm  S2=21 a h2=21 6.5 6.759321.9676 cm2  S=4 S2=4 21.9676=87.8703 cm2

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