Question

कक्षा 9 में अच्छे नंबर से उत्तीर्ण होने पर अपने मित्र को बधाई पत्र लिखिए​

Answer 1

Answer:

We know that volume of cylinder is πr²h, cube is side³, cuboid is length × breadth × height. But what's the origin of all these volume related formulas??

Don't need answer as "volume is defined as area of base times height". I need a valid proof for finding volume of any 3 dimensional solid figure such as sphere, cuboid, cone etc...