Gr 9 MATH: Ch 8.1 Angle Relationships
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Questions and Answers

What is the sum of angles on a straight line?

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

What are angles called when they sum to 180°?

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

What is the relationship between the angles formed when two perpendicular lines intersect?

  • Both angles are 90° (correct)
  • One angle is 90° and the other is 180°
  • Both angles are 45°
  • One angle is 90° and the other is 270°

What can be concluded about two lines that intersect to form equal angles?

<p>They are perpendicular (D)</p> Signup and view all the answers

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

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

What is true about vertically opposite angles?

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

What should you do first when drawing and interpreting graphs of angles and lines?

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

What is the name of the line that intersects two or more other lines?

<p>Transversal (B)</p> Signup and view all the answers

If two angles are supplementary, what can be said about the sum of their measures?

<p>The sum is always equal to 180° (B)</p> Signup and view all the answers

What is the relationship between the angles formed when two parallel lines are intersected by a transversal?

<p>Corresponding angles are equal, alternate angles are equal (A)</p> Signup and view all the answers

What is the name of the angle formed when two lines intersect, and the sum of the angles on each side of the intersection point is 180°?

<p>Vertically opposite angle (C)</p> Signup and view all the answers

If two lines are perpendicular, what can be said about the angles formed?

<p>Each angle is right (B)</p> Signup and view all the answers

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

<p>To measure the angles formed (D)</p> Signup and view all the answers

What is the relationship between co-interior angles when a transversal intersects two parallel lines?

<p>Their sum is 180° (A)</p> Signup and view all the answers

What is true about the equal angles formed when two lines intersect?

<p>They are vertically opposite (A)</p> Signup and view all the answers

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

<p>All of the above (D)</p> Signup and view all the answers

In a graph, two angles are formed on the opposite sides of the transversal and inside the two intersected lines. What can be said about these angles?

<p>They are co-interior angles. (B)</p> Signup and view all the answers

What can be inferred about two lines that intersect to form vertically opposite angles?

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

A transversal intersects two parallel lines, forming corresponding angles. What is the relationship between these angles?

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

What is the purpose of identifying parallel lines and transversals in a graph?

<p>To find relationships between angles. (C)</p> Signup and view all the answers

What is a characteristic of supplementary angles?

<p>They sum to 180°. (B)</p> Signup and view all the answers

In a graph, two lines intersect, forming four angles. What can be said about the sum of the two angles on one side of the intersection point?

<p>It is always 180°. (D)</p> Signup and view all the answers

What is the relationship between the alternate angles formed when two parallel lines are intersected by a transversal?

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

What is the name of the property that states that the sum of angles on a straight line is 180°?

<p>Linear pair theorem. (C)</p> Signup and view all the answers

If two lines intersect to form equal angles, what can be concluded about the lines?

<p>The lines are perpendicular. (A)</p> Signup and view all the answers

What is the relationship between the corresponding angles formed when a transversal intersects two parallel lines?

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

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

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

What is the purpose of identifying the parallel lines and transversal in a graph?

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

If two angles are vertically opposite, what can be said about their measures?

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

What is the relationship between the alternate angles formed when two parallel lines are intersected by a transversal?

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

What can be inferred about the angles formed when two lines intersect?

<p>They can be either equal or supplementary. (D)</p> Signup and view all the answers

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

<p>To check the properties of corresponding and alternate angles. (C)</p> Signup and view all the answers

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