Question

O piramida patrulatera regulata are muchia bazei egala cu 6 cm si apotema piramidei de 5 cm
a) Aria laterala a piramidei este egala cu...cm²
b) aria totala a piramidei este egala cu...cm²
c)inaltimea piramidei este egala cu...cm

Answer 1

a) Al=Pb*ap/2, Pb=4l=4*6=24
Al=24*5/2=60$cm^{2}$
At=Al+Ab, Ab=$l^{2}$=36$cm^{2}$
At=60+36=96$cm^{2}$
c) $h^{2}$=$ap^{2}$-$(l/2)^{2}$=25-9=16
h=$\sqrt{16}$=4 cm