Geometry2-Dimensional & 3-Dimensional Shapes : Geometry2-Dimensional & 3-Dimensional Shapes By: Melissa Miller Some Helpful Definitions : Some Helpful Definitions Shape – The outer form or outline.
Polygon – A closed plane figure bounded by straight lines.
Solid – A three-dimensional shape. 2-Dimensional Shapes : 2-Dimensional Shapes Circle : Circle A Circle is a figure bound by a curved line that is equally distant from any fixed point. Triangle : Triangle A Triangle is a three-sided figure with three angles. Parallelogram : Parallelogram A Parallelogram is a four sided figure with parallel opposite sides. The figures parallel sides are also the same length.
Can you find the parallelogram in the picture? Square : Square A Square is a parallelogram with four equal sides.
A Square is a polygon.
A Square is also a quadrilateral. Quadrilateral : Quadrilateral Here are several examples of a Quadrilateral.
A Quadrilateral is a four-sided polygon.
Another example……. Rectangle : Rectangle A Rectangle is a parallelogram with opposite sides of the same
All angles are right angles. Pentagon : Pentagon A Pentagon is a five-sided polygon. Hexagon : Hexagon A Hexagon is a six- sided polygon. Heptagon : Heptagon A Heptagon is a seven-sided polygon. Octagon : Octagon An Octagon is an eight-sided polygon. Nonagon : Nonagon A Nonagon is a nine-sided polygon. Decagon : Decagon A Decagon is a ten-sided polygon. Solids(Three Dimensional Shapes) : Solids(Three Dimensional Shapes) Sphere : Sphere A Sphere is a three-dimensional figure in the shape of a circle.
Every point on its surface is an equal distance from the center. Cylinder : Cylinder A Cylinder is a 3-Dimensional figure with the base of a circle
A Cylinder’s center moves along a straight line. Cube : Cube A Cube is a 3-Dimensional figure whose faces are all squares of the same size. Rectangular Prism : Rectangular Prism A Rectangular Prism is a 3-Dimensional figure with two parallel, matching bases. Cone : Cone A Cone is a 3-Dimensional figure with the base of a circle. Pyramid : Pyramid A Pyramid is a 3-Dimensional figure with one base and all sides are triangles.