When working with triangles in a co-ordinate system, the most important step is??
Drawing a sketch.
How can you prove that a triangle is right-angled in a co-ordinate system??
Find the gradients of the lines and prove two are perpindicular.
How can you prove two lines are perpindicular??
Show their gradients multiply to give $-1$.
How can you prove that a triangle is isoceles in a co-ordinate system??
Show two lines have the same length.
What step is often forgotten in proving a triangle is isceles in a co-ordinate system??
Not showing that there is at least one length different from the other two, otherwise it would be equilateral.
What does the notation $|AB|$ represent in terms of co-ordinate systems??
The length of line $AB$.
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date: 2020-09-21 18:20
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title: Maths - Triangles in a Co-ordinate System