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**Basic geometric FIGURES**

GEOMETRY Basic geometric FIGURES

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line a straight path that goes infinitely in opposite directions

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line segment a part of a line that has two endpoints

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ray a part of a line that has one endpoint and goes without end in one direction

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angle formed by two rays with the same endpoint

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**BASIC GEOMETRIC FIGURES**

Kinds of Angle

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right angle an angle that measures 90° (ninety degrees)

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acute angle an angle that measures less than 90° (ninety degrees)

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obtuse angle an angle that measures more than 90° but less than 180°

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straight angle an angle that measures exactly180°

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**BASIC GEOMETRIC FIGURES**

PAIRS OF LINES

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parallel lines lines that never meet even if extended infinitely in opposite directions

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intersecting lines lines that intersect at a common point

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perpendicular lines lines that intersect at right angles

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**BASIC GEOMETRIC FIGURES**

PLANE FIGURES

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CURVES

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closed curves

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POLYGONS triangle hexagon octagon square rectangle pentagon

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**POLYGON – a closed. plane figure that is. made up of three or**

POLYGON – a closed plane figure that is made up of three or more line segments

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PARTS OF A POLYGON Sides Angles Vertex (pl. vertices) – the point where two sides meet

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**DIAGONAL – connects. two vertices of a. polygon that are not**

DIAGONAL – connects two vertices of a polygon that are not next to each other DIAGONAL

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**All sides are the same length All angles are the same size**

REGULAR POLYGONS All sides are the same length All angles are the same size

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**Polygon with three sides**

TRIANGLE Polygon with three sides

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**Polygon with four sides**

QUADRILATERAL Polygon with four sides

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**FAMILY OF QUADRILATERALS GENERAL QUADRILATERAL or TRAPEZIUM**

PARALLELOGRAM TRAPEZOID ISOSCELES TRAPEZOID NON-ISOSCELES TRAPEZOID RECTANGLE RHOMBUS SQUARE

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**QUADRILATERAL – a polygon with four sides,. four**

QUADRILATERAL – a polygon with four sides, four angles and four vertices PARALLELOGRAM – a quadrilateral that has two pairs of opposite sides that are parallel RECTANGLE – a parallelogram that has four right angles RHOMBUS – a parallelogram that has four equal sides SQUARE – a rectangle that has four equal sides – a rhombus that has four right angles

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**TRAPEZOID – a quadrilateral with one pair of opposite sides parallel**

ISOSCELES TRAPEZOID – a trapezoid with one pair of opposite sides equal NON-ISOSCELES TRAPEZOID – a trapezoid with no equal sides

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PLANE FIGURES KINDS OF TRIANGLE

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**ACCORDING TO ITS SIDES ISOSCELES TRIANGLE EQUILATERAL TRIANGLE**

SCALENE TRIANGLE

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**a triangle that has two equal sides**

ISOSCELES TRIANGLE a triangle that has two equal sides

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**a triangle that has three congruent sides**

EQUILATERAL TRIANGLE a triangle that has three congruent sides

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**a triangle that has no equal sides**

SCALENE TRIANGLE a triangle that has no equal sides

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**ACCORDING TO THE ANGLES**

ACUTE TRIANGLE RIGHT TRIANGLE OBTUSE TRIANGLE EQUIANGULAR TRIANGLE

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**a triangle with one right angle**

RIGHT TRIANGLE a triangle with one right angle

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ACUTE TRIANGLE a triangle whose all angles are acute

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**a triangle with one obtuse angle**

OBTUSE TRIANGLE a triangle with one obtuse angle

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**a triangle that has 3 congruent angles (all angles measure 60°)**

EQUIANGULAR TRIANGLE a triangle that has 3 congruent angles (all angles measure 60°)

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TESSELLATIONS

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SLIDE

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FLIP

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TURN

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SYMMETRY

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SOLID FIGURES

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**DIMENSIONS OF A SOLID FIGURE**

LENGTH HEIGHT WIDTH

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PARTS OF A SOLID FIGURE EDGE FACE VERTEX

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CYLINDER A cylinder has two equal circular bases that are parallel

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PRISM a figure made of two parallel faces that are polygons of the same shape and sides that are parallelograms.

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RECTANGULAR PRISM A prism with rectangular faces

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**A prism with square faces**

CUBE A prism with square faces

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SPHERE a figure with a curved surface in which all points on the surface are equidistant from the center a solid figure that is shaped like a round ball

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PYRAMID A figure with a base that is a polygon and faces that are triangles

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CONE A solid figure that has one circular face and one curved surface

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