Răspuns:
3. A laterală=4×latura bazei×inaltimea prismei
V prisma =A bazei×inaltimea prismei
Al=4×l×h=128cm²
l×h=128/4
V=l²×h=128cm³
l×128/4=128 /:128
latura bazei=4cm
h=128/4×4
h=8cm
A totală=2×A bazei+A laterală=
2×l²+A laterală=2×16+128=32+128=160cm²
4. h=20cm
360cm³=V/2=1/2×Ab×h=1/2×(Ab×20)
Ab=2×360:20=720:20=36cm²
Ab=l²=36cm²
l=6cm
A laterală=l×4×h=6×4×20=480cm²
