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3 years ago

18. need help with this cone question

Mathematics

1 answer:

natita [175]3 years ago

5 0

answer

given

v=2100cm³

h=3r

v=1/3πr²h

soln

v=1/3πr²h

2100cm³=1/3×π×r²×3r( you will insert 3r in the place of h.)

2100cm³=3π/3×r³(cancel 3 by 3)

2100cm³= πr³

r³=2100cm³/3.14 ( π=3.14)

¾r³=¾2100cm³/3.14(I make them cube root.sorry I can't use the real cube root so I replace it by ¾)

r=8.74…

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