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9-12 Geometry Unit 6

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K-5 Math 6-8 Math •9-12 Math

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Algebra 1 •Geometry Algebra 2 Extra Support Materials for Algebra 1

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9-12

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Extra Support Materials for Algebra 1

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Unit 6

Glossary

Geometry

A directrix is the line that, together with a point called the focus, defines a parabola.

This diagram shows a parabola is the set of points equidistant from the focus and directrix.

used in:

A focus is the point that, together with a line called the directrix, defines a parabola.

This diagram shows a parabola is the set of points equidistant from the focus and directrix.

used in:

A median is a line drawn from a vertex of a triangle to the midpoint of the opposite side.

Each dashed line segment in this image is a median.

used in:

Two numbers are opposites if they are the same distance from 0 on the number line, but on opposite sides. One is negative, and the other is positive.

From an earlier course.

A parabola is the set of points that are equidistant from a given point, called the focus, and a given line, called the directrix.

used in:

Point-slope form is one way to write the equation of a line using its slope and the coordinates of one point on the line.

For a line with slope \(m\) through the point \((h,k)\), point-slope form is usually written as \(y-k=m(x-h)\). It can also be written as \(y = k+m(x-h)\).

<p>A line with point h comma k on an x y axis.</p>

used in:

Two numbers that multiply to equal 1 are reciprocals.

If \(p\) is a rational number that is not 0, then the reciprocal of \(p\) is the number \(\frac{1}{p}\).

used in:

Unit 6 Resources

Student Materials