Angles Flashcards
What is a right angle?
A 90* angle
What is an acute angle?
An angle less than 90*
What is an obtuse angle?
An angle between 90* and 180*
Draw an obtuse angle
See diagram page 165.
What is an straight angle?
An angle of 180*
Draw a straight angle
See diagram page 165.
What is a reflex angle?
An angle between 180* and 360*
Draw a reflex angle.
See diagram page 165.
What is a revolution?
360*
What are adjacent angles?
Hint- arrow shape
They have the same vertex and are alongside each other
What are complimentary angles?
Complementary angles add up to 90*
What are supplementary angles?
Supplementary angles add up to 180*
What do angles around a point add up to?
360*
In maths terms what does arm mean?
A ray of an angle
What is a vertex?
The point where the two arms of an angle meet
What is used to measure angles?
A protractor
What is a degree?
A unit used to measure angles
What are vertically opposite angles?
The equal angles formed when two straight lines intersect
See diagram on page 165
What are parallel lines?
Straight lines in the same plane that do not meet
See diagram on page 165
What are perpendicular lines?
Straight lines that meet at right angles
See diagram on page 165
What is a transversal?
A line that crosses two or more other lines.
Draw a transversal.
See diagram on page 165
What are alternate angles?
Angles that are inside straight lines and on opposite sides of a transversal.
See diagram page 165
What are cointerior angles?
Angles that are inside straight lines and on the same side of a transversal.
See diagram page 165
What are corresponding angles?
Corresponding angles are equal if the lines are parallel.
See diagram 165
