Question

Se da un con circular dreptunghic cu R= 3cm si h = 4cm . Sa se afle : G (l-am aflat eu dejea ) , Al , At si V . Urgent !!!!

Answer 1

   
[tex]\displaystyle \bf\\ Se ~da:\\ R = 3 ~cm\\ h = 4 ~cm\\ Se ~cere:\\ G,~ A_l,~ A_t,~V\\\\ Rezolvare\\\\ G = \sqrt{R^2 + h^2} =\sqrt{3^2 + 4^2} =\sqrt{9 + 16} =\sqrt{25} =\boxed{\bf 5~cm}\\\\ A_l = \pi RG = \pi \times 3 \times 5 = \boxed{\bf 15\pi~cm^2}\\\\ A_b = \pi R^2 = \pi 3^2 = \boxed{\bf 9\pi~cm^2}\\\\ A_t = A_b + A_l = 9\pi + 15 \pi = \boxed{\bf 24\pi ~cm^2}\\\\ V = \frac{Ab \times h}{3} = \frac{9\pi \times 4}{3} =\frac{36\pi }{3} = \boxed{\bf 12\pi ~cm^3}[/tex]