Question

if A(1,-2) and B(2,5) are two points. increasing the line OA and OB till C and D ,such that OC=2OA and OD=2OB. find CD

Answer 1

oc=2oa
od=2ob
therefore,oc+od=2oa+2ob
or,cd=2(oa+ob)
=2ab
=2 root under (1-2)^2+(-2-5)^2
=2 root under (-1)^2+(-7)^2
=2 root under 1+49
=2 root under 50
=2×5 root under 2
= 10 root under 2 answer