Area of a Circle (1 Viewer)

[untouchablecuz]

i was doing some MX2 and i somehow got onto attempting to prove the formula for the area of a circle from first principles

my Q's in the attachment

thanks

 

[shaon0]

i was doing some MX2 and i somehow got onto attempting to prove the formula for the area of a circle from first principles

my Q's in the attachment

thanks

Don't you just treat dx as any other variable like x?

 

[jet]

write sin(dx) as dx

Exactly, since for small dx, and you are considering small dx.