Loading the lesson
Loading the lesson
Search AllRounder.ai
Search the courses, subjects, tracks, games and features, or jump straight to a page.
Search the courses, subjects, tracks, games and features, or jump straight to a page.
2 cards from this section. Quick, good the night before a test.
State the relationship between direction cosines and direction ratios.
Think about how direction ratios are derived.
What is the sum of the squares of direction cosines?
Recall the equation that defines the direction cosines.
What do direction cosines represent?
Think about the term 'cosine' in relation to angles.
True or False: Direction ratios must always sum to one.
What property is unique to direction cosines?
Given points A(2, 3, 4) and B(5, 6, 7), derive the direction cosines and ratios, then find the angle they create with each axis.
Focus on the differences first—this will lead you to your direction cosines.
If a line has a direction ratio of (3, 4, 0), calculate the angle it makes with the X and Y axes.
Remember that angles can be found with the cosine of the direction cosine values.
4 more questions in this section. Enroll free to practise them all.
Enroll free