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The volume of the conical container is? 1? When the fan-shaped iron sheet with a central angle of 216 degrees and a radius of 5 is enclosed?
I think this should be considered as follows:
1, perimeter of conical ground = 216 / 360 x π x 10
=6π
2, conic ground radius = 6 π / 2 π
=3
3, conic height = (5 ^ 2-3 ^ 2) re square (no root sign)
=4
4. Cone volume (and volume) = sh
=3 ^ 2 π x 4 x 1 / 3 (cone volume formula)
=12π
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