Mai jos ai desenele cu cele doua figuri, trunchiul de piramida triunghiulara, respectiv patrulatera.
Formule: 1. Trunchiul de piramida triunghiulara regulata:
[tex]A_b= \frac{l^2 \sqrt{3} }{4} \\\\
A_B= \frac{L^2 \sqrt{3} }{4} \\\\
A_l= \frac{(P_B+P_b)*a_t_r}{2}\\\\
V= \frac{h}{3} (A_b+A_b+ \sqrt{A_b*A_B} )[/tex]
2.Trunchiul de piramida patrulatera regulata:
[tex]A_b=l^2\\
A_B=L^2\\
A_l= \frac{(P_B+P_b)*a_t_r}{2} \\\\
V= \frac{h}{3} (A_B+A_b+ \sqrt{A_b*A_B}) [/tex]
Aria totala pentru ambele piramidei folosesti formula: [tex]A_t=A_b+A_B+A_l[/tex]
