unit 1 - introduction - test #1 quizlet

AB and AC are opposite rays. All of the following are true except

AB = AC Teacher Only Solution Key. AB = AC. A has not been established as the midpoint of the two rays.

A universal set contains only sets A and B. If AN B=Ø then all of the following are true except :

AUB= {} Teacher Only Solution Key

Match the following items by entering the correct letter in Column 1 from Column 3. Possible correct answers and alternatives: A. PO Possible correct answers and alternatives: В. РО Possible correct answers and alternatives: С. РО Possible correct answers and alternatives: D. PQ + QR = PR Possible correct answers and alternatives: E. point P

Teacher Only Solution Key

A statement we accept without proof is called a:

postulate Teacher Only Solution Key A postulate is a statement we accept without proof.

Which of the following is not an undefined term?

ray Teacher Only Solution Key The three undefined terms in geometry are: point, line and plane.

If 3€ A and 3 B, then which of the following statements is not true?

3 is an element of ANB. Teacher Only Solution Key 3 is an element of ANB. In order to be in the intersection of the two sets, the element has to be in both sets.

There are 250 students taking band, chorus, or both. If there are 180 students taking band and 60 students in both band and chorus, how many students are only in chorus? (Hint: First find out how many students are only in band)

70 Teacher Only Solution Key. 70. If there are a total of 250 students, we subtract the 120 from band and the 60 from both band and chorus to get 70 that are only in chorus.

If point X is between W and Y then WX+XY = WY.

always

If RS = ST then point S is called the midpoint of RT.

sometimes Teacher Only Solution Key sometimes. This happens if RS and ST are rays on the same line.

Which set is a subset of every set?

{} Teacher Only Solution Key [ True ] The empty set is a subset of every set.

The multiplication property of equality could be used to solve which of the following equations?

b+(-2) = 18 Teacher Only Solution Key b (-2) = 18. This is because we need to multiply both sides by -2 in order to get the b alone on one side.

AUB={ }. This cannot be true because the union of the two sets is everything in the two sets. Since neither of the sets are the empty set, there is at least one element in each of them.

for the solution key

AR and BA name the same ray.

never Teacher Only Solution Key never. A ray goes in one direction. Naming it backwards would have to be an entire new ray.

Two lines that intersect in more than one point.

never Teacher Only Solution Key never. Lines are straight. The lines would have to curve in order to do this.

Three points are collinear.

sometimes Teacher Only Solution Key sometimes. If the three points are in the same plane they are coplanar.

Which of the following statements shows the inverse property of addition?

y+(-y)= 0 Teacher Only Solution Key y +(-y) = 0. Inverse property of addition adds to 0.

The complement of set M is:

{2, 5, 6, 8} Teacher Only Solution Key {2, 5, 6, 8}. Complement are the elements that are not in the set.

Which of the following sets represents MUN?

{3, 4, 6, 7, 9} Teacher Only Solution Key Use the following diagram to answer the given question: List the following set: M UN {3, 4, 6, 7, 9}