POINTA position in space, has no size only location•D •B •ND, B and N represent points
LINEContinues without end in opposite directions • • A B AB represents a line
PLANEA flat surface that extends in four directions
SEGMENTPart of a line made up of 2 points and all the points of the line between the 2 points• •D EDE represents a segment
RAYPart of a line consisting of one endpoint and all the points of the line on one side of the endpoint F • •GFG represents a ray
POLYG ONA simple closed figures by joining three or more line segments is called polygon
TRIANG LE formed by joiningIt is a closed figurethree line segments . So , a triangle is apolygon .The three line segments which form thetriangle are called its sides .
CIRCLEA 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.
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.
PARALLELO GRAMA 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.
RECTANGLEThe rectangle, like the square, is one of the most commonly known quadrilaterals. It is defined as having all four interior angles 90° (right angles).
SQUAREThe 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.
RHOMB USA 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.
TRAPEZI UMA 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.
KITEA kite is a member ofthe quadrilateral family, and while easyto understand visually, is a little tricky todefine in precise mathematical terms. Ithas two pairs of equal sides. Each pairmust be adjacent sides
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