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# how to prove a triangle with vertices is right angled with coordinates given watch

1. p
rove that the triangle with vertices A(1,2) B(4,2) C(3,5) is right angled

first i found the distance between the points AB which is 3.16 and BC is 3.16 and CA is 4.47
is that right and what do i do next
2. (Original post by Chez 01)
p
rove that the triangle with vertices A(1,2) B(4,2) C(3,5) is right angled

first i found the distance between the points AB which is 3.16 and BC is 3.16 and CA is 4.47
is that right and what do i do next

draw a graph of it, plotting the coordinates (1,2) (4,2) and (3,5) then join them to show the triangle and that will show you if its right angled or not
3. Two lines that are perpendicular to each other form right angles.
Hope this helps, spoiler has next step if not

Spoiler:
Show

so if you can show that either AB, AC or BC are perpendicular you can prove that ABC has a right angle.
4. thankyou inkypink, the spoiler was helpful
5. (Original post by Chez 01)
p
rove that the triangle with vertices A(1,2) B(4,2) C(3,5) is right angled

first i found the distance between the points AB which is 3.16 and BC is 3.16 and CA is 4.47
is that right and what do i do next
As 4.47x4.47 is equal to 3.16x3.16 + 3.16x3.16 its rightangled

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Updated: October 26, 2017
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