Unit 5 Vocabulary

By:Marissa

Acute AngleAn Acute Angle is an angle that is less than 90 degrees.For example: A 60 degree angle.

Adjacent AnglesAdjacent angles are angle that are next to each other.For example: In a straight angle, if you have one angle you can figure out the other.

AxisThe axis is how something is labeled. For example: an angle could be labeled JKL.

Bisecting an AngleBisecting an angle means to intersect with another angle.For example: Angle MN bisects with angle AB.

Concentric circles

Concentric circles are circles that have the same center.For example: The could be 3 concentric circles.

Congruent figures

Congruent figures are two figures that are exactly alike.For example: All line segments have the same length.

Consecutive angles

Consecutive angles are two angles in a polygon that share a common side.For example: A square has consecutive angles.

Corresponding angles or sides

They are the matching sides or angles of congruent polygons.For example: Each pair is the same length .

Inscribed

Inscribed means something whose vertices are all on the same circle.For example: All the points on the square is on the same circle.

Isometric

Isometric is changing the position of something but not losing its shape.For example: ”!” In an isometric transformation is “¡”.

Transformation

A transformation is moving something still keeping its shape.For example: Rotating an object.

Line of reflection

A line of reflection is a line halfway between a figure having an equal amount on the other side.For example:

Mid PointA mid point is a point halfway between two other points.For example: The middle of a line segment.

Obtuse AngleAn obtuse angle is an angle more than 90 degrees and less than 180 degrees.For example: 120 degrees.

Ordered number pair

Ordered number pair means two numbers that are used to locate a point on a coordinate grid.For example: The first number gives the position along the horizontal axis.

Parallel line

A parallel line is a line that is the same length between another line.For example: A line in a square is parallel to it’s opposite side.

Perpendicular

Perpendicular means meeting at right angles.For example: lines, rays, line segments meet at right angles.

Perpendicular bisector

This means that lines crossing each other still can meet at right angles.For example: A cross.

Preimage

Preimage means a geometric figure that is changed to make another figure.For example: A reflection, rotation or translation

ReflectionA reflection is flipping another shape over the line of reflection.For example: Looking at the opposite way of a figure.

Reflex AngleA reflex angle is an angle over 180 degrees and 360 degrees or under.For example: 270 degrees.

Right AngleA right angle is an angle that is at 90 degrees exactly.For example: All angles in a square are right angles.

Rotation Rotation is a movement of a shape around a point.For example: You can move a triangle around while keeping the top point in the same spot.

SectorA sector is a section of a circle.For example: A pizza slice.

Straight AngleA straight angle is an angle exactly at 180 degrees.For example: A straight line.

Supplementary anglesTwo angles that when added together equal 180 degrees.For example: Two right angles.

TranslationTranslation means moving a figure in a straight line.For example: Sliding a figure over.

Transversal

A line that crosses two or more other lines.For example: Two lines going horizontally and one vertically.

VertexA vertex is a point on a angle.For example: where two lines meet each other to make a right angle.

Vertical anglesVertical angles result when two lines intersect.For example: A cross sign.