Question

Ajutor! cu cat este egala aria totala a unei piramide patrulatere regulata cu muchia laterala 5 si latura bazei 8?

Answer 1

At=Al+Ab
Ab=l²
Ab=8²=64
Al=Pb*ap/2
Pb=4l
Pb=32
ap=VM
inΔVMB  cu <M=90
avem
VM=√VB²-BM²           BM=BC/2=8/2=4
VM=√5²-4²
VM=√25-16
VM=√9
VM=3
Al=32*3/2
Al=96/2=48
At=48+64
At=112