Altitude in geometry means perpendicular height.
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3 altitudes.
the point where the altitudes intersect is called the orthocenter.
Although they are altitudes, they are normally called the legs.
no; a triangle must have an obtuse angle if one of its altitudes is outside of the triangle, and in this case 2 of the altitudes are out of the triangle.
Yes, except that with a right angled triangle, two of the altitudes will also be the sides of the triangle.