Exercise 1: Vocabulary

Three undefined words in geometry are

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point

line

area

plane

space

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A line ___________ has two endpoints

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A __________ divides a line segment into two parts of equal length

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A ________ is the part of a line that begins at some point and continues forever in one direction

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An __________ is formed by two rays with a common endpoint

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An angle is measured in ________

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A _________ is used to measure angles

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The measure of an ________ angle is less than \(90^o\)

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The measure of a _________ angle is \(90^o\)

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The measure of an ________ angle is greater than \(90^o\) but less than \(180^o\)

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The measure of a _________ angle is \(180^o\)

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When two segments have the same length, we say that they are ________

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Adjacent angles have the same vertex, are side-by-side, and their interiors do not overlap

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True

False

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When two lines intersect, pairs of nonadjacent angles are called __________

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adjacent angles

vertical angles

complementary angles

supplementary angles

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When two angles have the same measure, we say that they are ____________

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The word sum indicates the operation of

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subtraction

addition

multiplication

division

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The sum of two complementary angles is

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60^o

90^o

180^o

360^o

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The sum of two __________ angles is \(180^o\)

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Three undefined words in geometry are

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Explanation

A line ___________ has two endpoints

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Explanation

A __________ divides a line segment into two parts of equal length

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Explanation

A ________ is the part of a line that begins at some point and continues forever in one direction

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Explanation

An __________ is formed by two rays with a common endpoint

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Explanation

An angle is measured in ________

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Explanation

A _________ is used to measure angles

Correct Answer

Explanation

The measure of an ________ angle is less than \(90^o\)

Correct Answer

Explanation

The measure of a _________ angle is \(90^o\)

Correct Answer

Explanation

The measure of an ________ angle is greater than \(90^o\) but less than \(180^o\)

Correct Answer

Explanation

The measure of a _________ angle is \(180^o\)

Correct Answer

Explanation

When two segments have the same length, we say that they are ________

Correct Answer

Explanation

Adjacent angles have the same vertex, are side-by-side, and their interiors do not overlap

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Explanation

When two lines intersect, pairs of nonadjacent angles are called __________

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Explanation

When two angles have the same measure, we say that they are ____________

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Explanation

The word sum indicates the operation of

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Explanation

The sum of two complementary angles is

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Explanation

The sum of two __________ angles is \(180^o\)

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Explanation

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