Ah, thank you. your question truly made the most of sense.

It is true only whenever x tends to 0(zero)
it is not importent that x be in radian or in degree.
Answer:
the answer is 125. if you cut them slice to slice you'll get 25 because of there five slices of 25 all you got to do is 25 x 5 and you'll get 125.
Hope this help
Have a nice day :)