Question

tedraedrul regulat abcd are ab=10cm .calculati aria totala a tedraedrului

Answer 1

ABCD - tetraedru regulat
AB=10 cm
Atot=?
Atot= $l^{2} \sqrt{3}$ = $10^{2} \sqrt{3}$ = $100 \sqrt{3}$

Answer 2

 $A_\Delta=\frac{10^2\sqrt3}{4}\;\;\rightarrow\;\;A_t=\not4\cdot\frac{100\sqrt3}{\not4}=100\sqrt3cm^2$