## 1. Line Segments

### 1.1. is a part of a line that is bounded by two distinct end points

### 1.2. https://www.splashmath.com/math-vocabulary/geometry/line-segment

## 2. Shapes

### 2.1. The form of an object - how it is laid out in space (not what it is made of, or where it is).

2.1.1. 2D

2.1.1.1. https://www.mathsisfun.com/shape.html

2.1.1.2. Circles

2.1.1.3. Triangles

2.1.1.4. Quadrilaterals

2.1.2. 3D

2.1.2.1. http://www.coolmath4kids.com/polyhedra/index.html

2.1.2.2. Spheres

2.1.2.3. Cubes

2.1.2.4. Pyramids

2.1.2.5. Cylinders

2.1.2.6. Prisms

### 2.2. http://www.kidsmathgamesonline.com/pictures/shapes.html

## 3. Lines

### 3.1. https://www.mathsisfun.com/geometry/dimensions.html

### 3.2. is a straight one-dimensional figure having no thickness and extending infinitely in both directions.

3.2.1. Parallel

3.2.2. Perpendicular

3.2.3. Straight

### 3.3. https://www.mathsisfun.com/geometry/dimensions.html

## 4. Points

### 4.1. A precise location or place on a plane. Usually represented by a dot.

### 4.2. http://www.basic-mathematics.com/basic-geometry.html

## 5. Angles

### 5.1. The amount of turn between two straight lines that have a common end point (the vertex).

5.1.1. Acute

5.1.1.1. an angle that is less than 90°

5.1.2. Right

5.1.2.1. an angle that is 90° exactly

5.1.3. Obtuse

5.1.3.1. an angle that is greater than 90° but less than 180°

5.1.4. Straight

5.1.4.1. an angle that is 180° exactly

5.1.5. Reflex

5.1.5.1. an angle that is greater than 180°

5.1.6. Circle

5.1.6.1. an angle that equals 360°

### 5.2. https://www.brainpop.com/math/geometryandmeasurement/angles/

## 6. Rays

### 6.1. A line with a start point but no end point (it goes to infinity)

### 6.2. http://www.mathopenref.com/ray.html

## 7. Symmetry

### 7.1. https://www.youtube.com/watch?v=PBW1dyOwUbA

### 7.2. Symmetry is when one shape becomes exactly like another if you flip, slide or turn it.

7.2.1. Reflection

7.2.2. Mirror

7.2.3. Rotational

7.2.4. Point

## 8. http://www.the-best-childrens-books.org/geometry-shapes.html

## 9. Geometry

### 9.1. http://www.learninggamesforkids.com/4th-grade-math/geometry-terms-4th.html

### 9.2. http://www.math-salamanders.com/4th-grade-geometry.html

## 10. Draw and identify lines and angles, and classify shapes by properties of their lines and angles.

### 10.1. CCSS.MATH.CONTENT.4.G.A.1

10.1.1. Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.

### 10.2. CCSS.MATH.CONTENT.4.G.A.2

10.2.1. Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.

### 10.3. CCSS.MATH.CONTENT.4.G.A.3

10.3.1. Recognize a line of symmetry for a two-dimensional figure as a line across the figure such that the figure can be folded along the line into matching parts. Identify line-symmetric figures and draw lines of symmetry.