Lines and Points
This is a straight path that continues in both directions forever and has no endpoints.
Line
An angle that measures less than 90 degrees is called ______.
Acute angle
A four-sided figure with four right angles is called a ______.
Square or rectangle
The common classroom tool used to draw straight lines and measure lengths in centimeters is a ______.
Ruler
Name the figure that has one endpoint and extends infinitely in one direction.
Ray
An angle that measures exactly 90 degrees is called a ______.
Right angle
A triangle with all three sides that are the same length is called a ______.
Equilateral triangle
A _________ triangle has at least two sides the same length.
Isosceles
Two lines that never meet, no matter how far they are extended, are called ______.
Parallel lines
An angle that measures more than 90 degrees is called a ______.
Obtuse angle
A quadrilateral with only one pair of parallel sides is called a ______.
Trapezoid
How many obtuse angles does an obtuse triangle have?
One
Where two or more line segments, rays, or lines cross.
Intersecting lines
What triangle is made up of three acute angles?
Equilateral triangle
A _______________ has two pairs of parallel sides.
Parallelogram
A _________ triangle has no sides the same length.
Scalene triangle
A line segment connecting two points of a polygon that are on different sides is called a ______.
Diagonal
What triangle has one 90 degree angle?
Right triangle
Which shape has four sides that are all the same length with opposite, parallel sides.
Rhombus
Name the tool used to measure angles in degrees.
Protractor