Question

Un cilindru circular drept are raza bazei de 4 cm si inaltimea de 5 cm.
Sa se afle:
a) aria totala a cilindrului;
b) volumul cilindrului.

Answer 1

   
[tex]a)\\ At = Ab1 + Ab2 + Al = \\\\ =\pi R^2 + \pi R^2 + 2\pi RG = \\\\ =\pi \times 4^2 + \pi \times 4^2 + 2\pi \times 4 \times 5 = \\\\ 16\pi + 16\pi + 40\pi = \boxed{72\pi ~cm^2}\\\\ b)\\ V = Ab \times h = \pi R^2h = \pi \times 4^2 \times 5 = \pi \times 16 \times 5 = \boxed{80 \pi~cm^3}[/tex]