
Mathematical
"H" Words half turn A turn of 180°. height In a triangle or trapezoid, the segment from a vertex perpendicular to the line containing the opposite side; also, the length of that segment. In a prism or cylinder, the distance between the bases. In a pyramid or cone, the length of a segment from the vertex perpendicular to the plane of the base. Also called altitude. height
of a trapezoid
The perpendicular distance
between the bases of a trapezoid. height
of a triangle The
perpendicular distance from any vertex of a triangle to the side opposite
that vertex. Also called altitude. hemisphere
The half of a sphere on one side of a great circle. heptagon A sevensided polygon. hexahedron
A polyhedron with six faces. hidden lines Lines in a picture or a threedimensional figure that cannot be seen, but which are marked as dashed or shaded lines so as to show existence or give a feeling of depth. hierarchy
A diagram that shows how various figures or ideas are related, often with
a down ward direction that moves from more general to more specific. Below
you will see the seven types of quadrilaterals arranged in a hierarchy.
A hierarchy is similar to a flowchart. horizontal
component of a vector
The first component in the ordered pair description of a vector, indicating
its magnitude along the xaxis of the coordinate plane.
horizontal line A line with an equation y = k on the coordinate plane. No matter what value "x" may assume, the "y" value for every point on this line is locked at the value "k". hyberbola
The conic section formed by a plane which intersects both of the right
conical surfaces. hypotenuse
The longest side of a right triangle; the side opposite the right triangle.
hypothesis The "if" clause of a conditional, also called the antecedent. An assumption used as the basis for an investigation or argument. Ex: If "x" is a positive number, then "x" is not equal to zero. (*The green part is the hypothesis)
