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ray

Part of a line that has one end point and goes in one direction without end.

line segment

Part of a line with two end points.

Intersecting lines

Two or more lines that meet at a common point.

Angle

Two rays with the same end point.

vertex

The point where two sides meet. (Shared end points of the line segments of a polygon.)

Acute Angle

An angle that measures LESS than 90 degrees.

Obtuse Angle

An angle that measures MORE than 90 degrees

right angle

An angle that is 90 degrees (It makes a square in the corner).

straight angle

An angle that measures 180 degrees

Adjacent Angles

Angles that are next to each other. They share a vertex and a common side.

Vertical Angles

Angles opposite one another when two lines intersect.

Congruent

A plane figure with the same size and shape.

Complementary Angles

The sum of the measure of two angles is 90 degrees.

Supplementary Angles

The sum of the measure of two angles is 180 degrees.

Scalene Triangle

A triangle with no congruent sides

isosceles triangle

Triangle with 2 equal sides and 2 equal angles.

equilateral triangle

Triangle with a 90° angle

Right Triangle

A triangle with one right angle.

acute triangle

A triangle with three acute angles.

obtuse triangle

A triangle with one obtuse angle.

Horizontal

Straight line across from side to side (length)

vertical line

Straight up and down line (height)

area

the surface; Length x Width

perimeter

The distance around a geometric figure.

volume

measures the amount of space taken up by the object.

coordinate plane

A plan formed by the intersection of a horizontal number line called the x-axis and a vertical number line called the y-axis.

ordered pair

A pair of numbers that can be used to locate a point on a coordinate plane.

1/2

sin (30°)

√2/2

sin (45°)

√3/2

sin (60°)

√3/2

cos (30°)

√2/2

cos (45°)

1/2

cos (60°)

1/√3

tan (30°)

1

tan (45°)

√3

tan (60°)

1/2

sin (π/6)

√2/2

sin (π/4)

√3/2

sin (π/3)

√3/2

cos (π/6)

√2/2

cos (π/4)

1/2

cos (π/3)

1/√3

tan (π/6)

1

tan (π/4)

√3

tan (π/3)