exam Maths Puzzle Numerical Ability

I know the perimeter is the measure around something but how do you find the perimeter of ABC if A= (2,6), B= (5,10) and C= (0,13)??? Help!!!

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exam Other Question

THere are 10 pictures available to place on exhibit in a museum. How many arrangements (permutations) are possible if 7 pictures are selected at a time? Write the equation of the line passing through the given pair of points.

(2,-3) and (2,4)
show work and equation please