Gr 9 MATH: Ch 8 Sum Geometry of Straight Lines
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Questions and Answers

What is the sum of angles on a straight line?

  • 360°
  • 270°
  • 90°
  • 180° (correct)

    • What is the term for two angles whose sum is 180°?

  • Corresponding Angles
  • Supplementary Angles (correct)
  • Alternate Angles
  • Complementary Angles

    • When two lines intersect to form equal angles of 90°, what can be said about the lines?

  • They are parallel
  • They are perpendicular (correct)
  • They are transversal
  • They are supplementary

    • What is the term for angles on opposite sides of a transversal but inside the two intersected lines?

    <p>Alternate Angles</p> Signup and view all the answers

    When a transversal intersects parallel lines, what can be said about the corresponding angles?

    <p>They are equal</p> Signup and view all the answers

    What is the sum of co-interior angles when a transversal intersects two lines?

    <p>180°</p> Signup and view all the answers

    What is the term for angles that are formed when two straight lines intersect?

    <p>Vertically Opposite Angles</p> Signup and view all the answers

    What should be done first when interpreting graphs of angles and lines?

    <p>Identify the lines and angles</p> Signup and view all the answers

    What is the sum of the measures of two supplementary angles?

    <p>180°</p> Signup and view all the answers

    What type of angles are formed when two lines intersect?

    <p>Vertically opposite angles</p> Signup and view all the answers

    When a transversal intersects two parallel lines, what type of angles are equal?

    <p>Corresponding angles</p> Signup and view all the answers

    What is the measure of a full revolution?

    <p>360°</p> Signup and view all the answers

    What type of angles have a sum of 180°?

    <p>Supplementary angles</p> Signup and view all the answers

    What type of lines intersect to form equal angles of 90°?

    <p>Perpendicular lines</p> Signup and view all the answers

    What is the first step in drawing and interpreting graphs of angles and lines?

    <p>Identify the lines and angles</p> Signup and view all the answers

    What type of angles are formed when a transversal intersects two parallel lines, on the same side of the transversal and inside the parallel lines?

    <p>Co-interior angles</p> Signup and view all the answers

    What is the characteristic of angles formed when two straight lines intersect?

    <p>They are always vertically opposite</p> Signup and view all the answers

    When a line intersects two parallel lines, what can be said about the alternate angles?

    <p>They are always equal</p> Signup and view all the answers

    What is the purpose of using a protractor when interpreting graphs of angles and lines?

    <p>To measure angles to check their properties</p> Signup and view all the answers

    What is the characteristic of co-interior angles when a transversal intersects two lines?

    <p>They are always supplementary</p> Signup and view all the answers

    What is the term for the line that intersects two or more other lines?

    <p>Transversal</p> Signup and view all the answers

    When two angles on a straight line sum to 180°, what type of angles are they?

    <p>Supplementary angles</p> Signup and view all the answers

    What is the characteristic of corresponding angles when a transversal intersects two lines?

    <p>They are always equal</p> Signup and view all the answers

    What is the measure of a half revolution?

    <p>180°</p> Signup and view all the answers

    What is the purpose of identifying corresponding angles when a transversal intersects parallel lines?

    <p>To verify that the corresponding angles are equal</p> Signup and view all the answers

    What is the relationship between vertically opposite angles when two lines intersect?

    <p>They are always equal</p> Signup and view all the answers

    What should be measured to check the properties of angles when a transversal intersects parallel lines?

    <p>The angles using a protractor</p> Signup and view all the answers

    What is the purpose of identifying co-interior angles when a transversal intersects parallel lines?

    <p>To check that the sum of co-interior angles is 180°</p> Signup and view all the answers

    What type of angles are formed when a transversal intersects two parallel lines, on the same side of the transversal and inside the parallel lines?

    <p>Co-interior angles</p> Signup and view all the answers

    What is the relationship between alternate angles when a transversal intersects parallel lines?

    <p>They are always equal</p> Signup and view all the answers

    What is the first step in drawing and interpreting graphs of angles and lines?

    <p>Identify the parallel lines, transversal, and the various angles formed</p> Signup and view all the answers

    What is the purpose of identifying alternate angles when a transversal intersects parallel lines?

    <p>To identify pairs of angles on opposite sides of the transversal</p> Signup and view all the answers

    If two angles on a straight line sum to 120°, what is the measure of the third angle?

    <p>60°</p> Signup and view all the answers

    What is true about the vertically opposite angles formed by two intersecting lines?

    <p>They are always equal.</p> Signup and view all the answers

    If two lines intersect and form equal angles of 90°, what can be said about the lines?

    <p>They are perpendicular.</p> Signup and view all the answers

    What is the relationship between the corresponding angles formed by a transversal intersecting two parallel lines?

    <p>They are always equal.</p> Signup and view all the answers

    If two parallel lines are intersected by a transversal, which of the following statements is true about the corresponding angles?

    <p>They are equal.</p> Signup and view all the answers

    What is the characteristic of the angles formed when a transversal intersects two parallel lines, on the same side of the transversal and inside the parallel lines?

    <p>Their sum is 180°.</p> Signup and view all the answers

    What is the purpose of measuring angles when a transversal intersects parallel lines?

    <p>To check the properties of angles.</p> Signup and view all the answers

    What is the purpose of identifying alternate angles when a transversal intersects parallel lines?

    <p>To determine the relationships between the angles.</p> Signup and view all the answers

    What is the relationship between the co-interior angles formed by a transversal intersecting two lines?

    <p>They are always supplementary.</p> Signup and view all the answers

    What should be determined first when interpreting graphs of angles and lines?

    <p>The lines and angles.</p> Signup and view all the answers

    What should be done after identifying the lines and angles in a graph?

    <p>Measure the angles to check their properties.</p> Signup and view all the answers

    What is the characteristic of the angles formed when two lines intersect?

    <p>They are vertically opposite.</p> Signup and view all the answers

    What is the purpose of using a protractor when interpreting graphs of angles and lines?

    <p>To measure the angles to check their properties.</p> Signup and view all the answers

    What is the characteristic of co-interior angles when a transversal intersects two lines?

    <p>Their sum is 180°.</p> Signup and view all the answers

    What is the relationship between vertically opposite angles when two lines intersect?

    <p>They are equal.</p> Signup and view all the answers

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