Draw a line perpendicular to the horizon axis, that goes from the top vertex, to a line that is the continuation of the base.
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Equilateral
Well, honey, the orthocenter of a right triangle is where all three altitudes intersect. In the case of a right triangle, the orthocenter coincides with one of the vertices, specifically the right angle vertex. So, grab your ruler and draw those altitudes to find that sassy orthocenter right at the corner of the right angle.
Find the supplement of a 74 angle?
the hypotenuse is the exterior angle
Use a protractor.