activity 1 power point presentations in geometry

PLANE AND SOLID
GEOMETRY
MARIELA A. CAMBA
Discussant

- the branch of mathematics that is concerned with the
properties and relationships of:
- points, lines, angles, curves, surfaces, and solids.
- The visual study of shapes, sizes, patterns, and positions.
What is
Geometry?

Geometry is really about two
things:
• The objects and their
properties. Analysis of things such
as points, lines, triangles.
• Proofs. A methodology for
proving that the claims made about
objects are really true.

Basic Concepts of Lines, Rays,
and Angles.

Lines!
Different Types:
 Line
 Line Segment
 Ray
 Perpendicular
 Parallel
 Intersecting

Line
 Has no beginning or end.
 Continues indefinitely in both directions.
 Can be illustrated by drawing arrows at each end.

Line Segment
 Has a beginning point and an end point.
 Line segments on a shape are called sides.
 Can be found in many shapes.

Ray
 Has a beginning point but no end point.

 Lines in the same
plane that do not
intersect or cross
each other.
Parallel

 Two or more lines that meet at a point.
Intersecting

 Perpendicular lines form a right or 90 degree angle.
Perpendicular

 Made up of two rays with the same start point.
 The start point is called the vertex.
 The two rays are called the sides of the angle.
Angles

A Protractor.
Measure Angles
with…

 Zero Angles
 Right Angles
 Acute Angles
 Obtuse Angles
 Straight Angles
 Supplementary Angles
 Complimentary Angles
Different Angles

 Plane Figure:
 A two-dimensional
shape (2D).
 A shape on a plane.
Includes points,
lines, polygons,
circles, triangles,
hexagon,
pentagons, etc.
 A plane figure is any
set of points on a
plane.

 Quadrilateral - a plane figure having four
sides and four angles.
 Parallelograms - a quadrilateral having both
pairs of opposite sides parallel to each other.

 Space figures are three dimensional figures.
 Faces: Side of the space figure
 Edges: Where two faces meet
 Vertex or Vertices: the corners of the space figures
EDGE
FACE
VERTEX
Space Figures!

activity 1 power point presentations in geometry

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