1. Basic geometric FIGURES
GEOMETRY
Basic geometric FIGURES

2. line
a straight path that goes infinitely in opposite directions

3. line segment
a part of a line that has two endpoints

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

5. angle
formed by two rays with the same endpoint

6. BASIC GEOMETRIC FIGURES
Kinds of Angle

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

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

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

10. straight angle
an angle that measures exactly180°

11. BASIC GEOMETRIC FIGURES
PAIRS OF LINES

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

13. intersecting lines
lines that intersect at a common point

14. perpendicular lines
lines that intersect at right angles

15. BASIC GEOMETRIC FIGURES
PLANE FIGURES

16. CURVES

17. closed curves

18. POLYGONS
triangle
hexagon
octagon
square
rectangle
pentagon

19. 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

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

21. 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

22. 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

23. Polygon with three sides
TRIANGLE
Polygon with three sides

24. Polygon with four sides
QUADRILATERAL
Polygon with four sides

25. FAMILY OF QUADRILATERALS GENERAL QUADRILATERAL or TRAPEZIUM
PARALLELOGRAM
TRAPEZOID
ISOSCELES
TRAPEZOID
NON-ISOSCELES
TRAPEZOID
RECTANGLE
RHOMBUS
SQUARE

26. 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

27. 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

29. PLANE FIGURES
KINDS OF TRIANGLE

30. ACCORDING TO ITS SIDES ISOSCELES TRIANGLE EQUILATERAL TRIANGLE
SCALENE TRIANGLE

31. a triangle that has two equal sides
ISOSCELES TRIANGLE
a triangle that has two equal sides

32. a triangle that has three congruent sides
EQUILATERAL TRIANGLE
a triangle that has three congruent sides

33. a triangle that has no equal sides
SCALENE TRIANGLE
a triangle that has no equal sides

34. ACCORDING TO THE ANGLES
ACUTE TRIANGLE
RIGHT TRIANGLE
OBTUSE TRIANGLE
EQUIANGULAR TRIANGLE

35. a triangle with one right angle
RIGHT TRIANGLE
a triangle with one right angle

36. ACUTE TRIANGLE
a triangle whose all angles are acute

37. a triangle with one obtuse angle
OBTUSE TRIANGLE
a triangle with one obtuse angle

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

39. TESSELLATIONS

41. SLIDE

43. FLIP

45. TURN

47. SYMMETRY

50. SOLID FIGURES

51. DIMENSIONS OF A SOLID FIGURE
LENGTH
HEIGHT
WIDTH

52. PARTS OF A SOLID FIGURE
EDGE
FACE
VERTEX

53. CYLINDER
A cylinder has two equal circular bases that are parallel

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

55. RECTANGULAR PRISM
A prism with rectangular faces

56. A prism with square faces
CUBE
A prism with square faces

57. 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

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

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