Reagan’s unit 5 math vocab

By: Reagan M

Acute angle

• An acute angle is an angle that measures less then 90 degrees.

Adjacent angles

• An adjacent angle is two angles that share the same vertex and sides but do not intersect.

Axis

• An axis are the lines that go vertical and horiztioal on a coorection grid, the axis are called y and x.

Bisecting an angle

• Bisecting an angle is when you divide an angle into two part, usually two even parts.

Concentric circle

• Two or more circles which have the same center point

Congruent figure

• Figures that have exactly the same shape ad size are said to be congruent to each other.

Consecutive angles

• Angles that occur one right after the other. Consecutive angles are on either end of the same line segment in a polygon.

Corresponding angles or sides

• Two angles that are located in the same relative location. If a transversal intersects two parallel lines, corresponding angles appear on the same side of the transversal.

Inscribed

• To draw on the inside of, touching as many points as possible.

Isometry

• An isometry is a transformation in which the original figure and its image are congruent.

Line of reflection

• The line of reflection is the perpendicular bisector of the segment joining every point and its image.

Midpoint

• A point on a line segment that divides it into two equal parts

Obtuse angle

• An obtuse angle is more than 90° but less than 180°

Ordered numbered pair

• Two numbers written in a certain order

Parallel Lines

• Two lines on a plane that never meet. They are always the same distance apart.

Perpendicular

• A line is perpendicular to another if it meets or crosses it at right angles

Perpendicular bisector

• Perpendicular Bisector is a perpendicular line or a segment that passes through the midpoint of a line.

Preimage

• The original figure before transformation

Reflection

• A transformation in which a geometric figure is reflected across a line, creating a mirror image.

Reflex angle

• A Reflex Angle is an angle which is more than 180° but less than 360°

Right angle

• An angle with a measure of 90 degrees

Rotation

• The distance from the center to any point on the shape stays the same.

Sector

• A "pie-slice" part of a circle - the area between two radiuses and the connecting arc of a circle.

Straight angle

• An angle that has a measure of 180 degrees and is half of 360 degrees

Transformation

• A transformation is a general term for four specific ways to manipulate the shape of a point, a line, or shape. The original shape of the object is called the pre-image and the final shape and position of the object is the image under the transformation.

Translation

• A transformation is a general term for four specific ways to manipulate the shape of a point, a line, or shape. The original shape of the object is called the pre-image and the final shape and position of the object is the image under the transformation.

Transversal

• A line that crosses at least two other lines

Vertex

• A point where two or more straight lines meet. A corner.

Vertical angles

• Vertical Angles are the angles opposite each other when two lines cross.