Question

Salut! Rezolvati-mi di mie urnatoarele probleme va rog!

Answer 1

Răspuns:

2) Ab=l^2 radical din 3 supra 4

16radical 3 =l^2 radical 3 supra 4

l^2radical 3=16radical3 ×4

l^2 radical 3=64 radical 3

l^2=64

l=8cm

At=Al+2Ab=96 radical 2+2×16 radical 3 =96 radical 2 + 32 radical 3=32(3radical2+radical3)

Al=Pb×h=24×4 radical 2=96 radical 2

Pb=3×l=3×8=24

V=Ab×h=16radical3×4 radical2=64 radical 6

3) 1 primă are 3 fețe laterale => Al=3×80 =240 cm^2

V=Ab×h=16radical3 ×10=160 radical 3

Ab=l^2 radical 3 /4 =8^2radical 3 /4 =64 radical 3 /4 =16 radical 3

Al=Pb×h

240=Pb×10

Pb=240:10=24

Pb=3×l

l=24:3 =8cm