bonjour,
1) SOI rectangle en O
pythagore
SI² = OI²+OS²
SI² =OI²+2,80²
OI = 1/2BC = 1,65m
SI² =1,65²²+2,80²
SI = √10,5625 = 3,25m
2) A base + 4(Aires latérales -triangles isocele)
3,3²+4(3,3*3,25)/2 =
10,89+21,45 = 32,34cm²
coût = 32,34*350= ...........
3) V pyramide = 1/3(3,3²*2,8)= 10,16m^3
tu conclus
