## Elementary Geometry for College Students (7th Edition)

Lets give the name ABC to the right triangle By pythagoras theorem $AB^{2}$ =$AC^{2}$ + $CB^{2}$ $AB^{2}$ = $5^{2}$ + $12^{2}$ $AB^{2}$ = 25 + 144 AB = 13 By definition of perimeter, The perimeter of the triangle ABC = AB+BC+CA =13 + 5 +12 =30 in