1.1.3 Measuring and Constructing Angles

Question 1

angle

Answer 1

a figure formed by two rays, or sides

Question 2

vertex

Answer 2

the common endpoint of an angle

Question 3

interior of an angle

Answer 3

the set of all points between the sides of the angle

Question 4

exterior of an angle

Answer 4

the set of all points outside the angle

Question 5

measure

Answer 5

an angle is usually given in degrees

Question 6

degree

Answer 6

since there are 360° in a circle, one degree is 1/360 of a circle

Question 7

acute angle

Answer 7

measures greater than 0° and less than 90°

Question 8

right angle

Answer 8

measures 90°

Question 9

obtuse angle

Answer 9

measures greater than 90° and less than 180°

Question 10

straight angle

Answer 10

formed by two opposite rays and measures 180°

Question 11

congruent angles

Answer 11

angles that have the same measure

Question 12

angle bisector

Answer 12

a ray that divides an angle into two congruent angles

Question 13

Protractor Postulate

Answer 13

Given line AB and a point O on line AB, all rays that can be drawn from O can be put into a one-to-one
correspondence with the real numbers from 0 to 180

Question 14

Angle Addition Postulate

Answer 14

If S is in the interior of ∠PQR, then m∠PQS + m∠SQR = m∠PQR