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.
of a trapezoid
The perpendicular distance
between the bases of a trapezoid.
of a triangle The
perpendicular distance from any vertex of a triangle to the side opposite
that vertex. Also called altitude.
The half of a sphere on one side of a great circle.
heptagon A seven-sided polygon.
A polyhedron with six faces.
hidden lines Lines in a picture or a three-dimensional 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.
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.
component of a vector
The first component in the ordered pair description of a vector, indicating
its magnitude along the x-axis 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".
The conic section formed by a plane which intersects both of the right
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)
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