Lines & Angles
What type of angle measures less than 90°?
Acute angle
How many sides does a triangle have?
3
What is a line that divides a shape into two equal halves called?
Line of symmetry
What tool do we use to measure angles?
Protractor
If one angle is 30° and another is 20°, what is the total?
50°
What type of angle measures exactly 90°?
Right angle
A shape with 4 equal sides and 4 right angles is called what?
Square
How many lines of symmetry does a square have?
4
How many degrees are in a full circle?
360°
A right angle is split into two angles: 40° and what?
50°
Name the angle that measures more than 90° but less than 180°.
Obtuse angle
What do you call a shape with exactly one pair of parallel sides?
Trapezoid
True or False: A rectangle always has 4 lines of symmetry.
False (it has 2)
If an angle measures 45°, is it acute, right, or obtuse?
Acute angle
If two angles make a straight line (180°) and one is 70°, what is the other?
110°
What type of angle measures exactly 180°?
Straight angle
True or False: All squares are rectangles.
Does a triangle always have at least one line of symmetry?
No
If you turn a quarter turn, how many degrees did you turn?
90°
Three angles measure 20°, 30°, and 40°. What is their total?
90°
True or False: Parallel lines will eventually cross.
False
Which of these is a type of parallelogram? (rectangle, triangle, trapezoid)
Rectangle
Which shape has no lines of symmetry: square, rectangle, or trapezoid?
Trapezoid
What is the sum of two right angles?
180°
A full circle is 360°. If you have angles of 100°, 120°, and 60°, what is the missing angle?
80°