Angles
An angle measuring greater than 90 degrees (but less than 180 degrees) is called an ______ angle.
obtuse
180 degrees
The sum of the angles in a triangle is ________.
180 degrees
The angles in a quadrilateral add up to _______.
360 degrees
An angle measuring greater than 180 degrees is called a ______ angle.
reflex
80 degrees
equal, equal
Name three examples of a parallelogram.
square, rectangle, rhombus
53 degrees would qualify as an _____ angle.
acute
When two straight lines intersect, they form vertically opposite angles. Vertically opposite angles are always ________.
equal
In a _________ triangle, all sides are equal, and every angle measures __________.
equilateral, 60 degrees
square, square
______ degrees create a full turn around a point.
360
Angles that form a right angle add up to ________.
90 degrees
In a _________ triangle, all sides have different lengths.
scalene
True or false: A rhombus can have four right angles.
True (a square!)
Sarah measured an angle using her protractor. She found the angle to be 100 degrees. Her teacher corrected her, telling her the angle was actually 260 degrees. What might have been Sarah's mistake?
The angle was a reflex angle, but Sarah measured the "inside" of it so it was just an obtuse angle. She needed to subtract 100 from 360 to get the correct measurement.
When two straight lines intersect, forming vertically opposite angles, how do you find the OTHER two angles?
True or false: An isosceles triangle cannot be an obtuse triangle.
False. There can be an obtuse triangle that has two equal sides and angles.
True or false: A trapezoid can include a right angle.
True