2.1 Exploring Patterns

Question 1

Adjacent Angles

Answer 1

Two angles are adjacent if they share a common vertex and side, but have no common interior points

Question 2

Line Segment

Answer 2

Line segment AB consists of the endpoints A and B and all points of the line AB that lie between A and B

Question 3

Ray

Answer 3

Ray AB consists of the initial point A, and all points on the line AB that lie on the same side of A as B lies

Question 4

Opposite Rays

Answer 4

If A is between B and C, then ray AB and ray AC are opposite rays

Question 5

Collinear

Answer 5

Points, rays, and segments that are on the same line are collinear

Question 6

Angle

Answer 6

An angle consists of two different rays and an initial point. The rays are the sides of the angle and the initial point is the vertex of the angle

Question 7

Acute Angle

Answer 7

An acute angle is an angle that measures greater than 0 degrees, and less than 90 degrees

Question 8

Right Angle

Answer 8

A right angle is an angle that measures 90 degrees

Question 9

Obtuse Angle

Answer 9

An obtuse angle is an angle that measures greater than 90 degrees, and less than 180 degrees

Question 10

Straight Angle

Answer 10

A straight angle is an angle that measures 180 degrees

Question 11

Interior of an Angle

Answer 11

Every nonstraight angle has an interior. A point D is in the interior of (angle sign) A, if it is between the points that lie on each side of the angle

Question 12

Exterior of an Angle

Answer 12

Every nonstraight angle has an exterior. A point D is in the exterior of (angle sign) A, if it is not on the angle or in the interior of the angle