What is the length of line segment lj? 9 units 12 units 15 units 18 units

The picture in the attached figurewe know thatin the right triangle mkjapplying the pythagorean theoremkj²=km²+mj²> kj²=6²+3²> kj²=36+9kj=√45find cos ∠jcos ∠ j=3/√> equation 1∠j+∠ l=90°> by complementary anglessocos ∠ j=sin ∠ lin the right triangle lkjsin ∠ l=√45/> equation 2equate equation 1 and equation 23/√45=√45/> 3*lj=> lj=45/3lj=15 unitsthe answer is  lj=15 units

These are the multiples of 15 but what you are probably asking or what are the factors of 15