How do I calculate the surface area?

Hello, I would like to know how to calculate the surface area of ​​the fourth body. I got 9405.6 cubic centimeters for V, r = 143.2 mm, and the mass is 1205.8 g. It would be great if someone could tell me how to calculate Ao.

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rumar
1 year ago

The radius (of the middle cylindrical part and at the same time the base circle radius of the two cones attached thereto) should be shorter than the mantle line m=116 of the cones.

The radius is increased from an invoice according to the set of Pythagoras in a suitable rectangular triangle.

The desired surface then arises:

Surface = cylindrical surface area + 2 x conical surface area

Willy1729
1 year ago

Hello,

you calculate the radius over the phrase of Pythagoras:
Root (1162-842)=80.

Cylinder equal to 2*pi*r*90; each cone:

pi*r*116.

Best regards,

Willy

Willy1729
1 year ago
Reply to  Anonym97262

Yeah, right.