Wednesday

August 20, 2014

August 20, 2014

Posted by **Bob** on Friday, December 7, 2012 at 4:11pm.

- Math -
**Steve**, Friday, December 7, 2012 at 4:41pmpick a vertex.

find the slope of the perpendicular to the opposite side.

find the equation of the line with that slope, going through the vertex.

pick another vertex and repeat

find the intersection of the two lines.

That's the orthocenter.

- Math -
**Bobby Fett**, Wednesday, January 9, 2013 at 1:35pmMethod:

Find the equation of two of those altitudes.

Solve the two equations to find their intersection point.

How?

Make a rough sketch

Pick any point and find the slope of the opposite side.

The slope of the altitude to that side is the negative reciprocal of the slope of that side.

Now you have the slope and a point on that line, find the equation for the line.

Repeat the above for a second altitude, solve the two equations.

PS, just noticed how nice your points are. One of the lines is a horizontal line, so the altitude from (1,3) to that line is x = 1

**Related Questions**

Geometry PLEASE HELP ME - ABC has vertices A(0, 6), B(4, 6), and C(1, 3). Sketch...

Orthocenter Question - Triangle ABC has vertices A(0,6), B(4,6) and C(1,3) Find...

maths - ABC is an acute triangle with ∠BCA=35∘. Denote the ...

maths - ABC is an acute triangle with \angle BCA = 35 ^\circ. Denote the ...

Geometry - ABC is an acute triangle with \angle BCA = 35 ^\circ. Denote the ...

math - Write a sequence of transformations that maps triangle ABC onto triangle ...

Geometry - in triangle ABC, BD bisects <ABC, <ABD = 4x + 6 and m<DBC = ...

Math - A(-11,8)B(2,-6) and C(-19,-8) are the vertices of Triangle ABC. N(X,Y) is...

math - Point A and B of a triangle ABC are at (-1,1) and (3,9), respectively; ...

algebra - The vertices's of triangle ABC are A(-1,2), b(0,3), and c(3,1). ...