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.
I have a quiz, please click "Like" next to the next answer.
Please click "Like" next to the answer.
If you have any other questions, please ask them separately.
Answer separately and adopt more. Thank you.