Geometry A Unit 3

Question 1

Acute triangle

Answer 1

A triangle in which all three angles are acute.

Question 2

Acute angle

Answer 2

An angle whose measure is less than 90°.

Question 3

Adjacent angles

Answer 3

Two angles in the same plane that have a common vertex and a common side, but no interior points in common.

Question 4

Angle

Answer 4

The union of two noncollinear rays that have a common end point.

Question 5

Auxillary Line

Answer 5

A line introduced in a figure to make a proof possible. (Model 3)

Question 6

Bisector of an Angle

Answer 6

A ray that is in the interior of the angle and divides the angle into two angles of equal measure.

Question 7

Comlementary Angles

Answer 7

Two angles with measures that, when added together, equal 90°. Each angle is called the complement of the other.

Question 8

Consecutive Vertices

Answer 8

The endpoint of one side of a polygon

Question 9

Consecutive Sides

Answer 9

Any two sides of a polygon that have a common end point.

Question 10

Corollary

Answer 10

A statement that is easily proved by applying a theorem. (Model 4)

Question 11

Triangle

Answer 11

The union of three segments determined by three noncollinear points.

Question 12

Transversal

Answer 12

A line that intersects two or more coplanar lines in different points.

Question 13

Supplementary Angles

Answer 13

Two angles with measures that, when added together, equal 180°. Each angle is called the supplement of the other.

Question 14

Skew Lines

Answer 14

Two lines that do not lie in the same plane

Question 15

Scalene Triangle

Answer 15

A triangle in which no two sides have the same length

Question 16

Remote Interior Angles

Answer 16

With respect to an exterior angle, the two interior angles of the triangle (Model 2)

Question 17

Right TRiangle.

Answer 17

A triangle in which one of the angles is a right angle.

Question 18

Right Angle

Answer 18

An angle whose measure equals 90°

Question 19

Diagonal of a Polygon

Answer 19

A segment joining two nonconsecutive vertices

Question 20

Polygon

Answer 20

Any closed figure bounded by three or more segments that only intersect at their end points. The segments are called the sides and the end points are called the vertices of the polygon.

Question 21

Regular Polygon

Answer 21

A polygon with all the angles equal and all the sides equal.

Question 22

Parallel Planes

Answer 22

Planes that have no point in common.

Question 23

Parallel Lines

Answer 23

Lines that are in the same plane and have no points in common. (| | lines)

Question 24

Obtuse Trianlge

Answer 24

A triangle in which one angle is obtuse.

Question 25

Obtuse Angle

Answer 25

An angle with a measure greater than 90° but less than 180°.

Question 26

Isosceles Triangle

Answer 26

triangle in which at least two sides have the same length.

Question 27

Exterior angle of a triangle

Answer 27

An angle formed by one side of a and an extension of another side. (Model 1)

Question 28

Equilateral Triangle

Answer 28

A triangle in which all three sides have the same length.