Angles
Greater than 0 and less than 90 degrees.
What is an acute angle?
180 degrees
What do the interior angles of a triangle sum to?
Two or more lines that are always of equal distance apart.
What does parallel mean?
Greater than 90 and less than 180 degrees.
What is an obtuse angle?
A triangle that has three equal sides.
What is an equilateral triangle?
An angle of 180 degrees.
What is a straight angle?
Exactly 90 degrees.
A triangle that has two sides of equal length.
What is an isosceles traingle?
Special pairs of angles that are in corresponding positions when a transversal crosses two lines.
What are corresponding angles?
They sum to 90 degrees.
What are complementary angles?
A triangle that has three sides of different lengths.
What is a scalene triangle?
They are equal due to their corresponding positions.
What is special about corresponding angles that exist when a transversal crosses two parallel lines?
They sum to 180 degrees.
What are supplementary angles?
Properties
What word is used to describe the different aspects of shapes, including triangles?
That lines are parallel
What does the same arrow set indicate?