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Need help on maths in length of a line segment

I need help in this question. Only on the first bit then I know how to do the rest. Thank you very much.
0D6CC77C-AAB7-4BA6-A1AD-B790A85FFC53.jpeg The question asks about calculating the length of the line segment AB. Give the answer to three significant figure,
Original post by Panicky student
0D6CC77C-AAB7-4BA6-A1AD-B790A85FFC53.jpeg The question asks about calculating the length of the line segment AB. Give the answer to three significant figure,

distance between A(x1,y1)A(x_1,y_1) and B(x2,y2)B(x_2,y_2) is (x1−x2)2+(y1−y2)2 \sqrt{ (x_1-x_2)^2+(y_1-y_2)^2}

basically find the length of the sides of the triangle and use pythagoras's theorem
You use Pythagoras' theorem on the right angled triangle depicted, knowing what AC and BC are in coordinate square units.

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