Question

A cone of metal with base radius 7cm & height 9cm was melted to make a wire of diameter 4mm .find the length of the wire

Answer 1

Answer:

3675cm

or

36.75m

Step-by-step explanation:

h 9cm

r 7cm

d of wire 4mm or 0.4cm

vol of cone

(1/3)×(22/7)×7×7×9

1/3 × 22×7×9

154/3×9

154×3

462

vol will be same for both

vol of cylinder

π×rsq×h

(22/7)×(2/10)×(2/10)×h= 462

22/7 × 1/25 × h =462

(22/7×25) ×h =462

h=462 × 7×25/22

h=3675