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Published byMoses May Modified over 4 years ago

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Polygons Two-dimensional shapes that have three or more sides made from straight lines. Examples: triangles squares rectangles

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**Sides The lines you can trace and count on the outside of a 2D shape.**

Example: A triangle has 3 sides. A square has 4.

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Parallelogram A quadrilateral with parallel opposite sides of equal length. Opposite angles are equal.

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Quadrilaterals Any two-dimensional shapes (polygon) with 4 straight sides and 4 angles The interior angles of a Quadrilateral add up to 360 degrees. Ex. rhombus kite rectangle trapezoid square

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Rectangle A 2D shape with 4 corners and 2 pairs of opposite, equal, parallel sides. The sides meet at right angles.

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**Rhombus A 2D, four-sided shape with opposite sides that are parallel.**

All the sides are the same length.

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**Rhombus A 2D, four-sided shape with opposite sides that are parallel.**

All the sides are the same length. Diagonals of a Rhombus bisect each other at right angles.

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**Trapezoid A 2D shape (polygon) with four sides.**

One pair of sides is parallel.

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**Trapezoid A 2D shape (polygon) with four sides.**

One pair of sides is parallel.

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**Square 2D shape (polygon) with 4 equal sides and 4 right (90°) angles.**

Opposite sides are parallel.

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Triangle Two-dimensional shape (polygon) with three straight sides and three angles. The interior angles of a triangle add up to 180 degrees. There are isosceles triangles, right triangles equilateral triangles scalene triangles

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Isosceles Triangle A triangle with equal sides and 2 equal angles

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Equilateral Triangle A triangle with equal sides and 3 equal angles.

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Right Triangle A triangle with one right angle (90 degrees).

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Scalene Triangles A triangle with 3 different side lengths and 3 different angle measures.

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Congruent Two figures are congruent if they have the same shape and size. Two angles are congruent if they have the same measure.

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**Rectangular Prism A 3D shape that has: 6 rectangular faces**

2 of those faces are equal 12 edges 8 vertices Some faces are parallel Some edges are parallel Some faces are perpendicular Some edges are perpendicular

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Pyramid A three-dimensional shape which has a polygon for its base and triangular faces which meet at one point (vertex).

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Cube A three-dimensional shape which has 6 square faces all the same size, 12 edges and 8 vertices. Some faces parallel Some edges parallel Some faces perpendicular Some edges perpendicular

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**Line An infinitely long, thin, two-dimensional mark**

It has no endpoints.

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**Line Segment A section of line bounded by two endpoints.**

A line segment is not continuous.

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Intersecting Crossing over one another. These lines are intersecting.

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**Parallel Lines that are the same distance apart from each other.**

These type of lines stay the same distance apart for their whole length. They do not need to be straight or the same length. They never intersect.

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Perpendicular Lines that intersect at a perfect right angle (90º) to one another. In solid shapes, edges could be at a right angle to one another. Faces could also be at right angles to one another.

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Angles A shape formed by two lines or rays that extend from a common point (vertex). The amount of turning between two lines that meet at a common point (vertex).

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Vertex (angles) The common point between two or more rays or line segments.

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Right Angle An angle whose measure is exactly 90 degrees.

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Symmetry An object is symmetrical when you can fold it in half and the two halves are congruent. One half is a mirror image of the other.

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**Symmetrical Not Symmetrical**

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