a pie is cut into 8 equel slices. if a person wants 0.75(pie sign) centimetre of crust, about how many pieces should they take?

I suspect this depends on the radius of the pie.

so then how can i do it? because this it the only detail im given!

There are too many variables (mostly missing). A definitive answer is impossible here. Also, learn to spell five letter words when issuing questions to people potentially preparing for standardized tests. "Equel" means nothing, and your question is utter BS.

To find out how many slices the person should take in order to get approximately 0.75 centimeters of crust, you can follow these steps:

1. Determine the total circumference of the pie: The circumference of a circle (in this case, the pie) can be calculated using the formula C = 2πr, where C is the circumference and r is the radius. However, since we don't have the radius information, we will have to assume that the pie is a perfect circle with a known diameter or length.

2. Given that the pie is divided into 8 equal slices, we can assume that the crust is evenly distributed, meaning each slice has an equal amount of crust. So, to find the length of crust on one slice, divide the circumference of the whole pie by 8.

3. Now that you know the length of crust on one slice, divide 0.75 centimeters by the length of crust on one slice to find out how many slices the person should take.

Keep in mind that this method is an approximate calculation, as the length of crust may not be the same for all slices due to variations in cutting.