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propertiesof2d3dshapes-21010703a1456.ppt
- 1. Objective: To describe propertiesof solid shapes such as perpendicular and parallel lines, faces and edges
- 2.
- 3. Two-dimensional Shapes (2D) •These shapes are flat and can only be drawn on paper. • They have two dimensions – length and width. • They are sometimes called plane shapes.
- 4. Three-dimensional Shapes (3D) •These shapes are solid or hollow. • They have three dimensions – length, width and height.
- 5. Face • Part ofa shape that is flat.(Or curved) • E.g. A cube has 6 of these.
- 6. Edge • The linewhere two faces meet. • E.g. A cube has 12 of these.
- 7. Vertex (Vertices) • Theplace where three or more edges meet. • This pyramid has 4 of these.
- 8. Parallel • These typeof lines stay the same distance apart for their whole length. They do not need to be straight or the same length.
- 9. Perpendicular • A linethat is drawn in a right angle to another line . • In solid shapes edges could be at a right angle to one another. • Faces could also be at right angles to one another.
- 10. Cube • A three-dimensional shapewhich has 6 square faces all the same size. Some faces parallel Some edges parallel Some faces perpendicular Some edges perpendicular
- 11. Cuboid • A three-dimensional shapewhich has 6 rectangular faces. Some faces parallel Some edges parallel Some faces perpendicular Some edges perpendicular
- 12. Sphere • A perfectlyround three-dimensional shape, like a ball. It has only one curved face. No perpendicular faces or edges No parallel faces or edges
- 13. Hemisphere • A three-dimensional shapethat is half a sphere. No parallel faces or edges No perpendicular faces or edges
- 14. Cone • A threedimensional shape with a circle at its base and a pointed vertex. No perpendicular faces or edges No parallel faces or edges
- 15. Cylinder • A three-dimensional shapewith circular ends of equal size. Some faces parallel Some edges parallel Some faces perpendicular No edges perpendicular
- 16. Pyramid • A three-dimensional shapewhich has a polygon for its base and triangular faces which meet at one vertex. •E.g. Triangular pyramid • Square pyramid • Hexagonal pyramid • Pentagonal pyramid
- 17. Square base pyramid Nofaces perpendicular Some edges perpendicular No faces parallel Some edges parallel
- 18. Prism • A threedimensional shape that has the same cross-section all along its length.
- 19. Written task Cube Cuboid Cone Square based-Pyramid Sphere Hemispere SOME PERPENDICULAR FACES NO PERPENDICULAR FACES SOME PARALLEL FACES NO PARALLEL FACES
- 20. Written task Cube Cuboid Square-based pyramid Sphere Hemisphere Cone SOMEPERPENDICULAR EDGES NO PERPENDICULAR EDGES SOME PARALLEL EDGES NO PARALLEL EDGES
- 21.
- 22. Polygons Two-dimensional shapes that havesides made from straight lines. • E.g. triangles squares hexagons
- 23. Quadrilaterals • Any two-dimensional shapeswith four straight sides. • E.g. square rhombus rectangle trapezium kite
- 24. Rectangle • A foursided two- dimensional shape with two pairs of parallel sides that meet at right angles.
- 25. Kite • A two-dimensional shapewith two shorter sides of equal length and two longer sides of equal length.
- 26. Rhombus • A two-dimensional foursided shape with opposite sides that are parallel and all the sides are the same length.
- 27. Trapezium • A two-dimensional shapewith four sides.One pair of sides is parallel with one side longer than the other.
- 28. Pentagon • A two-dimensional shapewith five straight sides and five angles.
- 29. Hexagon • A two-dimensional shapewith 6 straight sides and 6 angles.
- 30. Octagon • A two-dimensional shapewith 8 straight sides and 8 angles.
- 31. What do wecall a shape with: 7 Sides? 9 Sides? 10 Sides?
- 32. Circle • A roundflat two- dimensional shape.
- 33. Square • Two dimensional shapewith 4 sides of the same length and 4 90° angles.
- 34. Triangle • Two-dimensional shape withthree straight sides and three angles. • Can you name 4 different kinds?