In Review Exercises 18 to 23, use construction methods with the accompanying figure.
Given: 


Find:  The orthocenter 
To find: The orthocenter of the triangle ABC.
Given:
The triangle ABC is shown below.
Definition used:
Orthocenter:
The intersection of any two altitudes determines the orthocenter of a triangle.
Calculation:
Consider the triangle ABC.
First construct the altitude from A to
Draw an arc from A to intersect
Now draw equal arcs from D and E to intersect at X
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