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"The Graphic World Around Us" PPT Courseware 2
communication and discovery
(1) Observe the two pictures in Figures 1-5. Which surfaces do you find are flat? Are those noodles curved?
(2) Can you give examples of real objects with flat or curved surfaces?
Mathematically speaking, a plane has no boundaries and can extend infinitely in all directions. Mirrors, blackboards, playgrounds, calm water and other pictures (1-6) are all flat images.
All points on a graph are in the same plane. A graph like this is called a plane graph. Triangles, squares, parallelograms, trapezoids, circles, etc. are all plane figures
All points on a figure are not in the same plane. Figures like this are called three-dimensional figures. Sphere, cone, cube, cuboid, cylinder, etc. are all three-dimensional figures.
Combination and decomposition of graphics
Dig out the equilateral triangle from the regular hexagon
Regular hexagon covers an equilateral triangle
three trapezoids
Made of four large rectangles
Made up of four rectangles and four squares
practise
1. Indicate which faces in the following figures are flat? Which sides are curved?
2. Can you draw a five-pointed star using the pentagon in the picture? Draw a picture and then color it.
3. Please design a pattern composed of simple flat graphics and communicate with your classmates.
4. The following three figures are composed of two circles, two triangles, and two line segments.
Please use two circles, two triangles, and two line segments to combine several novel and interesting graphics, and provide text descriptions.
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"The Graphic World Around Us" PPT courseware:
"The Graphic World Around Us" PPT courseware Are you familiar with the various three-dimensional graphics in (Figure 11)? Use lines to connect the shapes with their corresponding names. Cubes, cuboids, cylinders, cones, spheres, etc. are all geometric entities. The prisms (Figure 12) and pyramids in the figure below...