Question

what is 3d objects with examples with formulas(areas,volumes)​

Answer 1

3D objects have 3dimensions that's why they are called as 3D objects the dimensions are areas ,volumes and heights .

Formulae:

Sphere=

surface Area=4pi r^3

volume=4/3pi r^3

Hemi sphere=

curved surface area=2pi r^2

total surface area=3pi r^2

volume=2/3pi r^3

etc. ,etc.