Multiple choice In the figure, △ABC is a right triangle, where the internal angle \angle C = 90\degree , \angle A=30° , the segment AD bisects ∠A , which one is the value of the expression \dfrac{AB}{CD}-\dfrac{AC}{CD}

Q&A A right triangle has the length of one leg 11 cm and length of the hypotenuse 61 cm. Calculate the height of the triangle on the side of the hypotenuse.