Question 1065320
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Okay I have to find the orthocenter of a triangle with the coordinates of P(2,5) Q(8,5) and R(8,1). 
If you map it out you get one horizontal side and one vertical side... A right triangle. My math teacher doesn't know how to teach. 
Please help me find the orthocenter. It's due tomorrow.
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Nothing can be easier.


For this right-angled triangle, as for ANY right-angled triangle, the ORTHOCENTER is the right angle vertex.



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By the way, do you know what the ORTHOCENTER of a triangle is ?


It is the intersection point of all three altitudes of the triangle.


Useful notice: For any triangle, its altitudes are concurrent, which means that all three altitudes intersect at one point.