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Mathematics needs wisdom.
Make AD perpendicular to BC and BC extension line of point D through point A..

Then the volume v obtained after rotation is equal to the large cone MINUS the small cone.

∠ Abd = 180- 120 = 60, so BD= 1 AD=√3.

V-cone = 1/3π (√ 3)? ×( 1+ 1.5)=2.5π

V-cone = 1/3π (√ 3)? × 1=π

Therefore, the required volume V = 2.5 π-π = 1.5 π.

Donors,

I think your bones are strange,

With a noble appearance and a source of wisdom,

He is one of the wizards in Wulin.

Concentrate on practice and you will achieve something in the future.

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