Question

A. dik r tabung 10cm,t 25cm tent 1.d,Lalas ,Ls,Lp V

Answer 1

Dik : r = 10 cm
        t = 25 cm
Dit:     d = ...?
       La = ...?
       LP = ...?
       V    = ...?

Jwb: d = 2r
            = 2. 10 cm
            = 20 cm

L.a = π. r²
      = 3,14 . (10 cm)²
      = 314 cm²

LP = 2.π.r.(r + t)
      = 2 x 3,14 x 10 cm x (10 cm + 25 cm)
      = 62,8 cm x (35 cm)
      = 2198 cm²

V = π.r².t
   = 3,14 x (10 cm)² x 25 cm
   = 7850 cm³