By: Emily Spoden

Trapezoid I’m a quadrangle that always has one pair of parallel lines.

Rectangle I’m a parallelogram with four right angles. I always have four sides and have two pairs of parallel lines.

Pentagon I am a polygon with 5 sides.

Octagon I am a polygon with 8 sides.

Regular Polygons I am a polygon whose sides are all the same length and angles are all equal.

Rhombus A quadrangle whose sides are all the same length.

Ellipse A circle with two focal points. All ellipses are ovals but not all ovals are ellipses.

Oval An egg-shaped curved non- polygon.

Quadrangle (Quadrilateral) I am a polygon that has four sides.

Parallelogram I am a quadrilateral with two pairs of parallel lines. My opposite sides are congruent.

Scalene Triangle I am a triangle with sides that are all different lengths. None of my angles are the same measure.

Right Angle A 90° angle.

Isosceles Triangle I am a triangle with at least two sides that are sides that are the same length. At least two of my angles have the same length.

Equilateral Triangle I am a triangle with all the same size sides and all my angles are the same measure.

Geometric Solids A 3-D shape, such as a prism, cylinder, cone, or sphere. It has a hollow inside despite its name.

Polyhedrons I am a 3-D figure whose surfaces, or faces, are all formed by polygons and their interiors.

Cylinder I am a 3-D shape with circular bases that are parallel and congruent and my side is rounded. I am shaped like a can.

Sphere I am a 3-D circle.

Cone I am a 3-D shape that has a circular base, curved surface and one vertex, called the apex.

Prism I am a 3-D solid that has two parallel faces that are congruent polygons and all other faces are parallelograms.

Pyramid I am a solid in which one face is any polygon and all the other faces are triangles that come together at a point called an apex.

Cube I am a polyhedron with six square faces. I have eight vertices and twelve edges.

Circle A set of points that is all the same distance from the center.

Diameter A line segment that passes through the center of a circle or sphere. It is twice the length of the radius.

Circumference The distance around a circle or sphere; the perimeter of a circle.

Radius A line segment from the center of a circle or sphere to any point on the circle or sphere.

Parallel lines Lines that never meet and the same distance apart. Parallel lines can be line segments, rays and lines.

Perpendicular Lines Two lines meeting at a right angles. Limes, rays, line segments can be perpendicular.

Intersecting Lines Meeting or crossing one another. Lines, line segments and rays can intersect.

Line of Symmetry A line drawn through a figure that divides it into parts that look EXACTLY the same but facing opposite directions.

Perimeter The distance around a 2-dimensional figure.

Area The amount of space inside a closed boundary. It is measured in square inches or centimeters.

Congruent Shapes Having exactly the same shape and size.

Similar Shapes Having the exact same shape but not necessarily the same size.

Degree A unit of measure for angles based on dividing a circle into 360 equal parts. ° Is used to represent degree. 180°

Acute Angle An acute angle is an angle that is greater than 0° but less than 90°.

Obtuse Angle An obtuse angle is an angle that is greater than 90° but less than 180°.

Straight Angle An angle that measures 180°.

90° Angle A right angle.

Reflex Angles An angle that is greater than 180° and less than 360°.

Adjacent Angles Angles that are next to each other; they have a common side, but no other overlap. They share a vertex.

Vertical Angles (opposite angles) When two lines intersect, the angles that do not share a common side. Vertical angles have equal measures. They are opposite from each other.

Supplementary Angles Two angles whose measures equal 180°.

Bar Graph A graph that uses horizontal or vertical bars to represent data.

Mean The sum of a set of numbers divided by the number of numbers in the set. The mean is often referred to as the average = /7= is the mean.

Maximum The greatest number in a set of data. 12, 15, 21, 26, 30, 32, 34

Minimum The smallest number in a set of data. 47, 45, 34, 58, 56, 67, 90, 78,

Mode The value or values that occur most often in a set of data. 67, 69, 78, 45, 67, 58, 34, 53, 26

Median The middle value in a set of data when the data is listed from smallest to largest. 56, 59, 64, 67, 68, 71, 73, 75, 80

Range The difference between the minimum and the maximum = 78