Vocabulary
Polygon- or shape has closed sides and has sides.
Square- has four sides and four vertices.
Triangle- has three sides and three vertices.
Pentagon- has five sides and five vertices.
Hexagon- has six sides and six vertices.
Heptagon- has seven sides and seven vertices.
Octagon- has eight sides and eight vertices.
Dodecagon- has twelve sides and twelve vertices.
3D polygons- have length, width, and height.
Some important 3D polygons:
Perimeter- is the measure of the outside of an object. It is the sum of all the sides outside of the figure.
Area- is the measure of the inside, or surface, of the object. Area is measured in square units.
Angle- is the measure of the turn in vertices.
Right angles- are 90° angles that looks like a capital L.
Obtuse angles- are angles that are larger than 90°.
Acute angles- are angles that are smaller than 90°.
Vertex- is another name for the corner that is formed in a polygon.
Square- has four sides and four vertices.
Triangle- has three sides and three vertices.
Pentagon- has five sides and five vertices.
Hexagon- has six sides and six vertices.
Heptagon- has seven sides and seven vertices.
Octagon- has eight sides and eight vertices.
Dodecagon- has twelve sides and twelve vertices.
3D polygons- have length, width, and height.
Some important 3D polygons:
- Cylinder- has the face of a circle but it is curved with no sides.
- Cone- has the face of a circle but has no sides, it is rounded like a cylinder but pointy like a triangle.
- Cube- has the shape of a square but it has 6 different faces.
- Rectangular prism- has the shape of a rectangle and has 6 different faces.
Perimeter- is the measure of the outside of an object. It is the sum of all the sides outside of the figure.
Area- is the measure of the inside, or surface, of the object. Area is measured in square units.
Angle- is the measure of the turn in vertices.
Right angles- are 90° angles that looks like a capital L.
Obtuse angles- are angles that are larger than 90°.
Acute angles- are angles that are smaller than 90°.
Vertex- is another name for the corner that is formed in a polygon.