Question

Ae considera piramida regulata VABCD cu AB=VA=8. Aria laterala a piramidei este egala cu ..........cm²

Answer 1

A=8*8=64cm2
deci aria este egala cu 64 centimetrii patrati

Answer 2

  $A_{laterala} = \frac{ P_{b}* ap }{2}= \frac{32*4 \sqrt{3} }{2} = 16*4 \sqrt{3} = 64 \sqrt{3} cm^{2} \\ P_{b}=4l =4*8=32 cm \\ triunghi VBM;m(M)=90grade=\ \textgreater \ (T.P ) VM^{2} = VB^2-BM^2 \\ VM^2=8^2-4^2 =\ \textgreater \ VM^2=64-16=\ \textgreater \ VM^2=48 =\ \textgreater \ VM= \sqrt{48} \\ VM=4 \sqrt{3} \\ VM=ap$