a)Al=Pb*ap/2
OM=1/3*AM
AM=l√3/2= 18√3/2=9√3
OM=1/3*9√3=3√3
ΔVOM, mas<O=90 ⇒VM²=VO²+OM²=24²+(3√3)²= 576+27=603 ⇒VM=3√67
Pb=3*18=54dm
Al=54*3√67/2=27 *3√67=81√67
b)At=Al+Ab
Ab=l²√3/4= 18²√3/4= 324 √3/4= 81√3
At=81√67+81√3 = 81(√67+√3)
c)V=Ab*h/3= 81√3* 24/3= 27√3 *24 = 648√3