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©A. Weinberg By Ms. Weinberg SOL 3.18
©A. Weinberg Let’s learn a bit about Geometry! Geometry is a part of Math that focuses on shapes and lines. Shapes Lines
©A. Weinberg Plane Figures are 2-dimensional figures. That means that they look flat. Triangle Rectangle Square Circle
©A. Weinberg Solid Figures are 3-dimensional figures. That means that they look like they can stand up on their own. Rectangular Solid cylinder Cube
©A. Weinberg Let’s take a look at some plane figures (2- dimensional). A square has 4 sides of equal length. 1 4 3 2
©A. Weinberg A rectangle has 4 sides and 4 corners. The 4 corners always make right angles. A right angle
©A. Weinberg A circle is a shape where all points are the same distance from the center. It does not have any sides or any corners.
©A. Weinberg A triangle is a shape with 3 sides and 3 vertices (points).
©A. Weinberg Now let’s learn about 3-dimensional shapes.
©A. Weinberg A cube is a 3-dimensional solid with 6 congruent square faces. Every face in a cube is a square and every edge is the same length. A cube has 8 corners and 12 edges. a square edge
©A. Weinberg A cylinder is a 3-dimensional object formed by 2 Congruent, Parallel Circles. The circles are joined by a curved surface. a curved surface
©A. Weinberg A rectangular solid is a 3-dimensional figure in which all 6 faces are rectangles. rectangle
©A. Weinberg A sphere is a 3-dimensional object with all of its points the same distance from the center. a ball is a sphere
©A. Weinberg A cone is a solid, pointed figure that has flat, round base. The base is usually a circle that is joined to the point (vertex) by a curved surface.
©A. Weinberg Now you know about 2-dimensional and 3- dimensional shapes. 2-dimensional figures are plane figures. They are flat and “on” the paper. 3-dimensional figures are solid figures. They look like they could stand up and you could touch them!
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