Chapter 9 Terms

Question 1

Square roots of 16

Answer 1

-4 and 4

Question 2

Closest whole number to the square root of 38

Answer 2

6

Question 3

What is the square root of -9?

Answer 3

not possible

Question 4

Set of real numbers includes…

Answer 4

all natural numbers, whole numbers, integers, rational numbers, and irrational numbers

Question 5

Which sets of real numbers include decimals?

Answer 5

Rational and Irrational numbers

Question 6

Which set of real numbers doesn’t include zero?

Answer 6

Natural numbers

Question 7

Irrational numbers include

Answer 7

imperfect (square) roots, Pi, and other non-repeating, non-ending decimals

Question 8

Rational numbers include…

Answer 8

any number that can be written as a fraction of integers (repeating or terminating decimals)

Question 9

vertex of an angle

Answer 9

the point where two rays join to make an angle

Question 10

Angle names: What is another name for angle JKL?

Answer 10

Angle LKJ, or Angle K

Question 11

Acute angle

Answer 11

an angle whose measure is between 0 and 90 degrees

Question 12

straight angle

Answer 12

an angle whose measure is 180 degrees

Question 13

obtuse angle

Answer 13

an angle whose measure is between 90 and 180 degrees

Question 14

right angle

Answer 14

an angle whose measure is 90 degrees

Question 15

When using a protractor to measure an angle, how can you decide whether to use the larger or the smaller of the two numbers?

Answer 15

If an angle is obtuse, use the larger number; if an angle is acute, use the smaller number

Question 16

Which sets of real numbers contain no negatives?

Answer 16

natural numbers and whole numbers