Side edges

The regular 4-sided pyramid has a body height of 2 dm, and the opposite side edges form an angle of 70°.
Calculate the surface area and volume of the pyramid.

Correct answer:

S =  12.7621 dm²
V =  2.6149 dm³

Step-by-step explanation:

$V={\displaystyle \frac{1}{3}}\cdot S_1\cdot h={\displaystyle \frac{1}{3}}\cdot 3.9223\cdot 2=2.6149{\text{dm}}^3$

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