what is the perimeter of a traingke whos poings are (1,9), (9,1) and (0,2)

Question

i need help answering this quesion

Answer 1

Use the distance formula (below) to compute the distance between all three points:

 

d = √[(x₂-x₁)²+(y₂-y₁)²]

 

Then just add the three distances together to get the perimeter.