Lesson 1 LINES LINE SEGMENTS RAYS ANGLES

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Lesson 1LINESLINE SEGMENTSRAYSANGLES
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OBJECTIVE

• By the end of the lesson, you will be able to
  identify and compare lines, line segments, rays,
  and angles.

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GEOMETRIC FIGURES

• LINE
• A line is a straight path that goes on
• without end in two directions.

The arrows show that the line does not end.
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GEOMETRIC FIGURES

• LINE SEGMENT
• A line segment is a part of a line.
• It has two end points.

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GEOMETRIC FIGURES

• RAY
• A ray is part of a line.
• It has one endpoint.
• A ray goes on without end in one direction.

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GEOMETRIC FIGURES

• PARALLEL LINES
• Parallel lines are the same distance
• apart and never meet.

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GEOMETRIC FIGURES

• INTERSECTING LINES
• Intersecting lines cross at a common
• point.

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GEOMETRIC FIGURES

• PERPENDICULAR LINES
• Perpendicular lines cross at right
• angles.

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GEOMETRIC FIGURES

• ANGLE
• An angle is formed by two rays with the
• same endpoint.

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GEOMETRIC FIGURES

• RIGHT ANGLE
• A right angle has a square corner.
• It measures 90 º.

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GEOMETRIC FIGURES

• ACUTE ANGLE
• Some angles are less than a right
• angle.
• They are acute angles.

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GEOMETRIC FIGURES

• OBTUSE ANGLE
• Some angles are greater than a right
• angle.
• They are obtuse angles.