Ineed can someone give me with this question it’s very much appreciated

|AB| signifies "distance between A and B," |BC| "distance between B and C, and |CA| "distance between C and A."  Using the distance formula

Find the numerical value of these three distances / lengths.
Sounds as though there was a diagram here which has not come through and is thus not visible.

|AB|^2 = (11-8)^2 + (13-2)^2 = 9 + 121 = 130.

Likewise, find |BC|^2 and |CA|^2.

Does the sum of the smaller two squares equal the largest square?  If so, the triangle is a right triangle.  

Are any two of these squares equal?  If so, this is an isosceles triangle.  

He will need 2,898 pieces of paper