Chap 9

Question 1

Point

Answer 1

An exact location in space.

Question 2

Ray

Answer 2

Part of a line that continues without end in one direction and the other end has an endpoint.

Question 3

Line

Answer 3

A straight path continuing without end in two opposite directions .

Question 4

Line segment

Answer 4

Part of a line with two endpoints.

Question 5

Vertex

Answer 5

Point at which two line segments or rays meet to form an angle.

Question 6

Degrees

Answer 6

A unit of angle measure. The symbol is ° .

Question 7

Protractor

Answer 7

Instrument used for measuring angles .

Question 8

Acute angle

Answer 8

An angle with a measure of LESS than 90°.

Question 9

Obtuse angle

Answer 9

An angle with a measure of MORE than 90°

Question 10

Right angle

Answer 10

An angle with a measure of EXACTLY 90°

Question 11

Straight angle

Answer 11

An angle with the measure of exactly 180°

Question 12

Turn

Answer 12

1/4, 1/2 , 3/4 , or a full turn which correspond to angles 90° , 180° , 270° , 360°.

Question 13

Inner scale

Answer 13

Inner set of the protractor

Question 14

Outer scale

Answer 14

Utter set of the readings of the protractor.