Question

va rog ajutatima la 3 si 4​

Answer 1

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