Basic Geometry
These are lines that lie or contained on the same plane.
Coplanar Lines
It is an angle that measures less than 180º but more than 90º.
Obtuse
It is a polygon with 11 sides.
Undecagon/ Hendecagon
These are two or more circles that have the same center, but different radii.
Concentric circles
These are two angles whose sum of their measurements is 180 degrees.
Supplementary angles
These are non coplanar lines that do not intersect.
Skew Lines
If m∠ABC is 83º, then what kind of angle is ∠ABC?
Acute angle
How many interior angles are there in a regular 36 – gon?
36
It is the chord that passes through the center of a circle and twice the length of the radius.
diameter
It is a line that intersects a circle at exactly one distinct point.
Tangent line
It is a branch of math whose literal meaning is "Earth's Measurement".
Geometry
These are two angles whose sum of their measurements is 90 degrees.
Complementary angles
It is the sum of the measures of the interior angles of a pentagon.
540º
It is an angle whose vertex is a point on the circle.
Inscribed Angle
These are two non adjacent angles formed when two lines intersect.
Vertical angles
It is an undefined terms that is described as a flat surface that extends indefinitely in all directions.
Plane
These are two angles that have a common vertex and a common side but no common interior point.
Adjacent angles
The surface of a stop sign is in the shape of a regular octagon. What is the measure of each interior angle of the sign?
135º
It is the distance around the circle.
Circumference
These polygons are equilateral as well as equiangular.
Regular Polygons
It is a part of a line with one endpoint and extends indefinitely in one direction.
Ray
If m∠3 = (4x – 31)º and m∠6 = (2x + 7)º, what is the value of x if these two angles are supplementary?
34º
It is the measure of each interior angles of a regular decagon.
144º
What is the circumference of circle O having a diameter of 20 cm (use π = 3.14)?
62.8 cm
What is the area of a circle with a diameter of 18 centimeters?
254.34 cm2