This angle is less than 90 degrees.
What is an acute angle?
There are these many degrees in a circle.
What is 360o?
The sum of the angles in a triangle.
What is 180o?
This is the line that intersects two parallel lines.
What is a transversal?
These lines have equal slopes.
What are parallel lines?
This angle is more than 90 degrees.
What is an obtuse angle?
This is the equation for the circumference of a circle.
What is 2 x pi x r?
In an isosceles triangle, these angles are congruent.
What are base angles?
Two angles in the same relative postition between parallel lines.
What are corresponding angles?
The slope of a line is known by this shorthand.
What is "rise over run"?
Two angles whose sum is 180o.
What are supplementary angles?
This is the equation for the area of a circle.
What is pi x r2?
This triangle has no equal sides and no equal angles.
What is a scalene triangle?
Angles between the parallel lines and on different sides of the transversal.
What are alternate interior angles?
These lines have slopes that are the negative reciprocal of each other.
What are perpendicular lines?
Two angles whose sum is 90o.
What are complementary angles?
This line "just touches" a circle when it passes by it.
What is a tangent line?
This is the equation for the area of a triangle.
What is 1/2(base x height)?
Angles outside of the parallel lines and on different sides of the transversal.
What are alternate exterior angles?
If line AB has a slope of 3/4, and line CD is perpendicular, this is the slope of CD.
What is -4/3?
For angles formed by intersecting lines, these angles are congruent.
What are vertical (opposite) angles?
This line goes from one point to another on the circle's circumference.
What is a chord?
The Pythagorean Theorem.
What is a2 + b2 = c2?
Angles between the parallel lines and on the same side of the transversal.
What are consecutive interior angles?
If the line XY has a slope of 2/3, then the line FH (parallel to XY) has a slope of ____ and the line DS (perpendicular to XY) has a slope of ____.
The slope of FH: 2/3
The slope of DS: -3/2