a) muchia piramidei =L
A(VBD)=100√3
Atriunghi echilateral=L²√3/4=100√3 L²=400 L=20
b)inaltimea piramidei
A(VBD)=BD × h/2 = 20 ×h/2 =100√3
h=100√3/10=10√3
c) volumul piramidei
latura bazei piramidei 2l²=BD²=400 l²=200 l=10√2
V=Ab × h/3 =(10√2)²×10√3/3=2000√3/3=666,(6)√3≈1154,7