Geometry
- 2. POINT A position in space, has no size only location •D •B •N D, B and N represent points
- 3. LINE Continues without end in opposite directions • • A B AB represents a line
- 4. PLANE A flat surface that extends in four directions
- 5. SEGMENT Part of a line made up of 2 points and all the points of the line between the 2 points • • D E DE represents a segment
- 6. RAY Part of a line consisting of one endpoint and all the points of the line on one side of the endpoint F • •G FG represents a ray
- 7. POLYG ON A simple closed figures by joining three or more line segments is called polygon
- 8. TRIANG LE formed by joining It is a closed figure three line segments . So , a triangle is a polygon . The three line segments which form the triangle are called its sides .
- 9. CIRCLE A closed curve formed in such a way that any point on this curve is equidistant from a fixed point which is in the interior of the curve.
- 10. QUADRILATE RAL It is a closed figure formed by joining four line segments called quadrilateral. So quadrilateral is a polygon. Different shapes of quadrilateral are shown below: The four line segments which form a quadrilateral are called its sides.
- 11. PARALLELO GRAM A parallelogram is a quadrilateral with opposite sides parallel (and therefore opposite angles equal). A quadrilateral with equal sides is called a rhombus, and a parallelogram whose angles are all right angles is called a rectangle. And, since a square is a degenerate case of a rectangle, both squares and rectangles are special types of parallelograms.
- 12. RECTANGLE The rectangle, like the square, is one of the most commonly known quadrilaterals. It is defined as having all four interior angles 90° (right angles).
- 13. SQUARE The square is probably the best known of the quadrilaterals. It is defined as having all sides equal, and its interior angles all right angles (90°). From this it follows that the opposite sides are also parallel. • A square is simply a specific case of a regular polygon, in this case with 4 sides. All the facts and properties described for regular polygons apply to a square.
- 14. RHOMB US A rhombus is actually just a special type of parallelogram. Recall that in a parallelogram each pair of opposite sides are equal in length. With a rhombus, all four sides are the same length. It therefore has all the properties of a parallelogram.
- 15. TRAPEZI UM A trapezium is defined by the properties it does not have. It has no parallel sides. Any quadrilateral drawn at random would probably be a trapezium. Since it has no interesting properties beyond those of a quadrilateral, it is not used much in geometry.
- 16. KITE A kite is a member of the quadrilateral family, and while easy to understand visually, is a little tricky to define in precise mathematical terms. It has two pairs of equal sides. Each pair must be adjacent sides