Geometry Vocabulary part 2
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30 Terms
Complementary Angles
Two angles whose sum is 90 degrees.
Supplementary Angles
Two angles whose sum is 180 degrees.
Perpendicular Lines
Two lines that intersect to form right angles
Parallel Lines
Two lines are parallel if they are coplanar and do not intersect.
Skew lines
are noncoplanar lines; they will not intersect.
Polygon
Union of 3 or more coplanar segments that meet only at endpoints, such that at most two segments meet at one endpoint, and each segment meets exactly two other segments
Regular Polygon
A Polygon that is equilateral and equiangular
Congruent Triangles
Two triangles are congruent if corresponding sides are congruent and corresponding angles are congruent
Median of a Triangle
Segment from the vertex of a triangle to the midpoint of the opposite side.
Altitude of a triangle
Segment from the vertex of a triangle perpendicular to the line containing the opposite side
Parallelogram
A quadrilateral with both pairs of opposite sides parallel.
Rectangle
A Parallelogram with a right angle.
Rhombus
A Parallelogram with consecutive sides congruent.
Square
All sides congruent and all four right angles.
Trapezoid
A Quadrilateral with exactly one pair of opposite sides parallel.
Ratio
Comparison of two numbers by division.
Proportion
An equation that states two ratios are equal.
Pythagorean Theorem
In a right triangle, the sum of the squares of the legs is equal to the square of the hypotenuse.
Circle
The set of points in a plane that are equidistant from a fixed point called the center.
Radius
Segment whose endpoints are the center of the circle and a point on the circle.
Chord
A segment that connects two points on the circle.
Diameter
The chord that passes through the center of the circle.
Secant
line that intersects a circle in two points.
Tangent of a circle
line in the plane of the circle that intersects the circle in one point.
Concentric circles
Two or more circles in the same plane with the same center
Congruent circles
Circles that have congruent radii.
Sphere
A set of points in space a given distance from a given point called the center.
Arc
Consists of two points and the continuous part of a circle between them.
Semi-circle
Arc whose endpoints are the endpoints of a diameter.
Minor arc
Arc whose measure is less than a semicircle or 180 degrees