Question

a mound of rice is roughly in the shape of a cone of height 12 cm and base diameter 40 cm . Use the value 3 for pie to find the approximate volume of rice

Answer 1

Answer:

188.57 m^2

Step-by-step explanation:

Here, d=12m. So, r=212=6m and h=8m

⇒  Required volume =31×πr2h

                                    =31×722×6×6×8

                                    =301.71m^3

⇒  Let l be the slant height of cone

∴  l2=r2+h2

∴  l2=(6)2+(8)2

∴  l2=36+64

∴  l2=100

∴  l=10m

⇒  To cover a heap we need curve surface area of cone.

⇒  Curve surface area =πrl

                                       =722×6×10

                                       =188.57m^2

⇒  Required volume is 301.71m^3 and Canvas cloth required to cover heap is 188.57m^2