if vector r1= 4m along north east and r2 vector = 2m due north, find vector mgnitude r1 + r2 and r1 - r2.

r1 is along north east and r2 is along north, angle between r1 and r2 is 45 degree

  r1+r2=r12+r22+2r1r2cosθθistheanglebetweenr1andr2r1+r2=4m2+2m2+24m2mcos45°r1+r2=20m2+16m212=20+82r1+r2=25+22mr1-r2=r12+r22-2r1r2cosθr1-r2=4m2+2m2-24m2mcos45°r1-r2=20m2-16m212=20-82r1-r2=25-22 m

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