Question

what is the perimeter of triangle with side 3i+4j+5k , 4i-3j-5k and 7i+j

Answer 1

the perimeter, P, of a  triangle is given by the  formula
P = a + b + c
where a, b and c are the side lengths of the triangle
where P=(3i+4j+5k)+(4i-3j-5k)+(7i+j+0k)
             =(14i+2j)
             =2(7i+j) 

Answer 2

perimeter of a triangle = a+b+c where a,b,c are the three sides of the triangle.

a=  3i+4j+5k
b=  4i-3j-5k
c=  7i +j

perimeter = (3i+4j+5k)+(4i-3j-5k)+(7i+j)
 = 3i+4j+5k+4i-3j-5k+7i+j
 = 14i + 2j



hope it helps!!!!