Why is this not a 85° angle?

85° is an acute angle. This picture shows an obtuse angle as it is more than 90°.

85° is an acute angle. The picture shows a right angle as it is 90°.

85° is an obtuse angle. The picture shows an acute angle as it is less than 90°.

85° is an obtuse angle.The picture shows an acute angle as it is less than 90°.

Is this the correct way of using a protractor to measure an angle

No, because the baseline of the protractor is not aligned properly with the bottom ray of the angle.

Yes, because the vertex of the angle is aligned with the center point of the protractor.

This is the wrong way of using a protractor because __________.

the vertex of the angle is not aligned to the center point of the protractor.

the bottom line of the angle is not aligned to the baseline of the protractor.

Do you agree that ∠a = 90°.

No. The measurement is not accurate because the bottom line of the angle is not aligned to the baseline of the protractor.

Yes. The top line of the angle is aligned to 90°.

Measuring Angles with a Protractor Not on Zero

Quiz

•

Mathematics

•

4th Grade

•

Practice Problem

•

Hard

•

CCSS

4.MD.C.6, 4.G.A.1

Standards-aligned

Anthony Clark

FREE Resource

17 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

70^o

110^o

Tags

CCSS.4.MD.C.6

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

6^o

14^o

174^o

186^o

Tags

CCSS.4.MD.C.6

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

20^o

160^o

180^o

Tags

CCSS.4.MD.C.6

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

71^o, acute

109^o, obtuse

Tags

CCSS.4.MD.C.6

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

20^o

160^o

Tags

CCSS.4.MD.C.6

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

55^o

65^o

125^o

135^o

Tags

CCSS.4.MD.C.6

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

125^o

115^o

75^o

65^o

Tags

CCSS.4.MD.C.6

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