1st Semester Geometry Final - Vocabulary

Question 1

Acute Angle

Answer 1

An angle with measure between 0 and 90 degrees.

Question 2

Adjacent Angles

Answer 2

Two angles that share a common vertex and side, but have no common interior points.

Question 3

Altitude of a Triangle

Answer 3

The perpendicular segment from one vertex of the triangle to the opposite side or to the line that contains the opposite side.

Question 4

Angle Bisector

Answer 4

A ray that divides an angle into two angles that are congruent.

Question 5

Centroid

Answer 5

The point of concurrency of the thee medians of the triangle.

Question 6

Circumcenter

Answer 6

The point of concurrency of the three perpendicular bisectors of the triangle.

Question 7

Complementary Angles

Answer 7

two angles whose measures have the sum 90 degrees. the sum of the measures of n angle and its complement is 90 degrees.

Question 8

Collinear Points

Answer 8

Points that lie on the same line.

Question 9

Equiangular

Answer 9

Angles are congruent.

Question 10

Equidistant

Answer 10

The same distance from one figure as from another figure.

Question 11

Equilateral

Answer 11

Sides are congruent.

Question 12

Hypotenuse

Answer 12

In a right triangle, the side opposite the right angle.

Question 13

Incenter

Answer 13

The point of concurrency of the three angle bisectors of the triangle.

Question 14

Isosceles Triangle

Answer 14

A triangle with at least two congruent sides.

Question 15

Linear Pair

Answer 15

Two adjacent angles whose non common sides are opposite rays.

Question 16

Median

Answer 16

A segment from one vertex of the trangle to the midpoint of the opposite side.

Question 17

Midpoint

Answer 17

A point that divides, or bisects, a segment into two congruent segments.

Question 18

Midsegment of a Triangle

Answer 18

A segment that connects the midpoints of two sides of the triangle.

Question 19

Obtuse Angle

Answer 19

An angle with measure between 90 and 180 degrees.

Question 20

Orthocenter

Answer 20

The point at which the lines containing the three altitudes of the triangle intersect.

Question 21

Perpendicular Lines

Answer 21

Two lines that intersect to form a right angle.

Question 22

Polygon

Answer 22

A closed plane figure with the following properties. 1) It is formed by three or more line segments called sides. 2) Each side intersects exactly two sides, one at each endpoint, so that no two sides with a common endpoint are collinear.

Question 23

Postulate

Answer 23

A rule that is accepted without proof. Also called “Axiom.”

Question 24

Quadrilatoral

Answer 24

A polygon with four sides.

Question 25

Scalene Triangle.

Answer 25

A triangle with no congruent sides.

Question 26

Segment Bisector

Answer 26

A point, ray, line, segment, or plane that intersects a segment at its midpoint.

Question 27

Skew Lines

Answer 27

Lines that do not intersect and are not coplanar.

Question 28

Supplementary Angles

Answer 28

Two angles whose measures have the sum 180 degrees.

Question 29

Theorem

Answer 29

A true statement that follows as a result of other true statements.

Question 30

Vertical Angles

Answer 30

Two angles whose sides form two pairs of opposite rays.