Investigate if the triangle with the corners ABC is right-angled, when the corners are in the coordinates A (4, -4), B (11, -1) and C (9,3).
Does this mean simply plot it out on a graph paper and see? Or is there some sort of math towards doing this that doesn't require drawing it down.
2 answers
Yeah, it means to plot the points and then say if it is a right-angled triangle.
no, they want you to take the slope of the 3 lines.
If one slope is the opposite reciprocal of another, then those two lines are perpendicular.
I will assume you know how to take slopes.
Plotting will help, it could show where angles are obviously not equal to 90°,
but suppose the lines make an angle of 89°, this would be hard to judge.
If one slope is the opposite reciprocal of another, then those two lines are perpendicular.
I will assume you know how to take slopes.
Plotting will help, it could show where angles are obviously not equal to 90°,
but suppose the lines make an angle of 89°, this would be hard to judge.
2 answers