Angle Knowledge
Circles
Triangles
Angle Positions
Slope
100

This angle is less than 90 degrees.

What is an acute angle?

100

There are these many degrees in a circle.

What is 360o?

100

The sum of the angles in a triangle.

What is 180o?

100

This is the line that intersects two parallel lines.

What is a transversal?

100

These lines have equal slopes.

What are parallel lines?

200

This angle is more than 90 degrees.

What is an obtuse angle?

200

This is the equation for the circumference of a circle.

What is 2 x pi x r?

200

In an isosceles triangle, these angles are congruent.

What are base angles?

200

Two angles in the same relative postition between parallel lines.

What are corresponding angles?

200

The slope of a line is known by this shorthand.

What is "rise over run"?

300

Two angles whose sum is 180o.

What are supplementary angles?

300

This is the equation for the area of a circle.

What is pi x r2?

300

This triangle has no equal sides and no equal angles.

What is a scalene triangle?

300

Angles between the parallel lines and on different sides of the transversal. 

What are alternate interior angles?

300

These lines have slopes that are the negative reciprocal of each other.

What are perpendicular lines?

400

Two angles whose sum is 90o.

What are complementary angles?

400

This line "just touches" a circle when it passes by it.

What is a tangent line?

400

This is the equation for the area of a triangle.

What is 1/2(base x height)?

400

Angles outside of the parallel lines and on different sides of the transversal.

What are alternate exterior angles?

400

If line AB has a slope of 3/4, and line CD is perpendicular, this is the slope of CD.

What is -4/3?

500

For angles formed by intersecting lines, these angles are congruent.

What are vertical (opposite) angles?

500

This line goes from one point to another on the circle's circumference. 

What is a chord?

500

The Pythagorean Theorem.

What is a2 + b2 = c2?

500

Angles between the parallel lines and on the same side of the transversal. 

What are consecutive interior angles?

500

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