Harry is flying his broomstick directly towards a goal in quidditch which is 20 meters away. Harry noticies that Malfoy is 45 degrees to his right. Malfoy is also flying directly towards the same goal. Malfoy calculates that Harry is 50 degrees to his left. Based on that information, how far apart is Malfoy from the goal?

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

where is the option given

54/3 is 18 so 18 is your answer