planes and shapes

PLANE AND SOLID SHAPES Shapes are everywhere! Shapes can be plane, which means flat, and shapes can be solid. Let's explore shapes in more detail. OBJECTIVES Compare and contrast lines, polygons, and shapes. Define and recognize plane (flat) shapes. Define and recognize solid shapes. VOCABULARY 2- flat shapes; they do not take up space and have only length and dimensional width 3- solid shapes; they take up space and have length, width, and dimensional height circle a continuous line equally distant from its center closed plane shape which has all its outer lines connecting figure cone solid shape; shaped like a party hat

cube solid square shape; shaped like an ice cube; all sides are equal cylinder solid tube shape; shaped like the roll inside paper towels dimension length and width of a rectangle or square; length, width, and height for solids equal sides two or more lengths between endpoints of a polygon are the same flat shape plane shape with only length and width hexagon polygon with six equal sides octagon polygon with eight equal sides oval plane shape formed by a continuous line in shape of an egg pentagon polygon with five equal sides plane shape flat figure with only length and width polygon closed, plane figures with 3 or more sides pyramid solid shape; sides look like triangles rectangle four-sided polygon with two equal opposite sides and four right angles rhombus polygon with four equal sides and two acute angles solid shape shapes that take up space, have height sphere solid circular shape; shaped like a ball square polygon with four equal sides triangle three-sided polygon

 Show Transcript Shapes may look flat or solid. Plane (or flat) shapes lie flat on the surface. They do not take up space. This means they have length and width but not height. The length is the longer side and the width is the shorter side. Length and width are called dimensions. Plane shapes are called two-dimensional shapes because they have two dimensions, length and width. Look at the example of two plane shapes. Find the dimensions of each one. Example: Shapes can have more than one name. Shapes can be open or closed. An open shape (or figure) is one in which all sides do not connect. There is a break in the formation of the shape. Closed figures do not have any breaks. All of their sides connect. Another term for a closed plane shape is polygon. Polygons are closed, plane figures that are made of line segments. A polygon has at least three line segments. Squares, rectangles, triangles, hexagons, and other flat shapes are also called polygons. Look at the chart below to see examples of these figures and shapes. Can you see why the figure at the bottom is not a polygon?

Did you say that the bottom figure is not a polygon because it is not made up of line segments? If you did, you were right! Good job! Squares, rhombuses, and rectangles have four sides. They are all polygons, but they are also different shapes. A rhombus differs from a square and a rectangle by having an acute angle. That means that the top and bottom angles of the rhombus shape are not the same as the side angles. We will learn more about angles later. Plane shapes are all around us. A piece of paper is an example of a rectangle. Doors and windows are rectangles. Watch the road signs when you are riding in a car. They have different shapes. This yield sign is a triangle.

Plane Shapes Do you recognize these plane shapes by name? Circle: a closed line with points equally distant from the center Hexagon: a six-sided polygon Triangle: a three-sided polygon Pentagon: a five-sided polygon Rectangle: a four-sided polygon with opposite sides equal and four right angles Rhombus: a four-sided polygon with opposite angles equal Oval: a closed plane shape with no straight sides and length greater than width Square: a special rectangle with all sides equal Octagon: an eight-sided polygon

Solid shapes do not lie flat on the surface. They do take up space; this means they have length, width, and height. Length, width, and height are dimensions. Solid shapes have all three of these dimensions. The solid shapes below are named pyramid, sphere, cube, cylinder, and cone. Examples of solid shapes:  Show Transcript Plane shapes are flat shapes. They do not take up space. Solid shapes do take up space. This means they have height. The dimensions of a solid shape are length, width, and height. Solid shapes are three- dimensional figures.

Can you name these solid shapes? Cone: solid with circular base and shaped like a party hat Cube: solid with length, width, and height all equal Cylinder: solid with 2 circular bases shaped like a can or tube Pyramid: solid formed from triangular surfaces on base that is square Sphere: curved solid shaped like a ball