Question

From a solid cylinder of height 10 cm a hemispherical depression of diameter 7cm is made . find the surface area of the remaining solid

Answer 1

Answer:

335.5

Step-by-step explanation:

h = height of cylinder = 10cm

r = radius of hemisphere

  =radius of cylinder

  = $\frac{7}{2}$cm

surface area of remaining solid :

c.s.a. of cylinder +area of base of cylinder + c.s.a. of hemisphere

= 2πrh + π$r^{2}$ + 2π

= 2×$\frac{22}{7}$×$\frac{7}{2}$×10 +

= 220 + 38.5 + 77

= 335.5