Protractor - Geometry - Math Dictionary

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Angle Measure

Protractor

Protractor is a tool used to measure the angles.

More about Protractor

Some of the protractors are half circle protractors to measure angles up to 180° and some of them are full circle protractors to measure angles up to 360°.

Example of Protractor

Solved Example on Protractor

Find the measure of ∠XYZ.

Choices:
A. 1050
B. 750
C. 1800
D. 1300
Correct Answer: A
Solution:
Step 1: ∠XYZ is made up of two rays, YX and YZ, with the common endpoint Y.
Step 2: ∠XYZ is the measure between YX and YZ.
Step 3: On the protractor scale, YX is passing through 180° and YZ is passing through 75°.
Step 4: Difference = 180° - 75° = 105°
Step 5: The measure of ∠XYZ is 105°.

Related Terms for Protractor

Angle
Measure

Additional Links for Protractor

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Browse for solved examples below on this Math Dictionary term:

SC BM Curriculum > Grade 5 > Measurement > II.B.3: Using a protractor, measure angles between 0 and 180 degrees inclusive.

GA BM Curriculum > Benchmark - Algebra II > Geometry & Spatial Sense; Measurement > C[22]: Degree, Protractor: Measures angles using a protractor.

GA BM Curriculum > Grade 6 > Geometry & Spatial Sense; Measurement > C[22]: Degree, Protractor: Measures angles using a protractor.

GA BM Curriculum > Grade 7 > Geometry & Spatial Sense; Measurement > 26: Angle Measurement: Measures angles using a protractor.

GA BM Curriculum > Grade 8 > Geometry & Spatial Sense; Measurement > 27: Degree, Protractor: Measures and draws angles using a protractor and classifies angles by their measures (e.g., acute, obtuse, right, straight, complementary, supplementary).

GA GPS BM curriculum > Grade 8 > Geometry & Spatial Sense; Measurement > 27: Degree, Protractor: Measures and draws angles using a protractor and classifies angles by their measures (e.g., acute, obtuse, right, straight, complementary, supplementary).

PA BM Curriculum > Grade 7 > Measurement > 7.B.2.2.2: Measure angles using a protractor up to 180° - protractor must be drawn – the bottom of the angle to be measured should line up with the bottom of the protractor

PA BM Curriculum > Grade 8 > Measurement > M8.B.2.2.1: Measure angles up to 180 degrees using a protractor (drawn or provided).

California Assessment Curriculum - 2006 > Grade 5 > Geometry & Measurements > 5MG2.1-Measure, identify, and draw angles, perpendicular and parallel lines, rectangles, and triangles by using appropriate tools (e.g., straightedge, ruler, compass, protractor, drawing software).

Michigan Assessment Curriculum - 2006 > Grade 5 > Interpreting Geometry > G.GS.05.02-Measure angles with a protractor and classify them as acute, right, obtuse, or straight.

MIssissippi Assessment Curriculum - 2006 > Grade 5 > Interpreting Measurement > 4.f-Estimate the measure of angles and verify with a protractor.

Ohio Assessment Curriculum - 2006 > Grade 8 > Exploring Measurement > 8-Find the sum of the interior and exterior angles of regular convex polygons with and without measuring the angles with a protractor.

Minnesota Assessment curriculum - 2006 > Benchmark - Algebra II > Geometry and Measurement > V.B.4-Measure, identify, and draw perpendicular and parallel lines, angles and rectangles by using appropriate tools such as straightedge, ruler, compass, protractor or software.

Minnesota Assessment curriculum - 2006 > Grade 6 > Geometry and Measurement > V.B.4-Measure, identify, and draw perpendicular and parallel lines, angles and rectangles by using appropriate tools such as straightedge, ruler, compass, protractor or software.

New Jersey Assessment Curriculum - 2006 > Grade 5 > Geometry, Measurement, and Spatial Relationships > 4.2.5.E.1-Use a protractor to measure angles.

New Jersey Assessment Curriculum - 2006 > Benchmark - Algebra II > Geometry, Measurement, and Spatial Relationships > 4.2.6.E.1-Use a protractor to measure angles.

New Jersey Assessment Curriculum - 2006 > Grade 6 > Geometry, Measurement, and Spatial Relationships > 4.2.6.E.1-Use a protractor to measure angles.

Wisconsin Assessment Curriculum - 2006 > Benchmark - Algebra II > Exploring Measurement > D.b.2-Determine angle measurement to nearest five degrees using a protractor.

Wisconsin Assessment Curriculum - 2006 > Grade 6 > Exploring Measurement > D.b.2-Determine angle measurement to nearest five degrees using a protractor.

Massachusetts Assessment Curriculum - 2006 > Geometry > Geometry > G.G.4-Draw congruent and similar figures using a compass, straightedge, protractor, or computer software. Make conjectures about methods of construction. Justify the conjectures by logical arguments.

Florida Assessment curriculum - 2006 > Benchmark - Algebra II > Exploring Measurement > MA.B.1.3.2.6.1-Identifies a protractor as a tool for measuring angles and measures angles using a protractor.

Florida Assessment curriculum - 2006 > Grade 6 > Exploring Measurement > MA.B.1.3.2.6.1-Identifies a protractor as a tool for measuring angles and measures angles using a protractor.

Florida Assessment curriculum - 2006 > Grade 7 > Exploring Measurement > MA.B.1.3.2.7.1-Finds the measure of an angle by measuring with a protractor or applying angle relationships.

Florida Assessment curriculum - 2006 > Grade 7 > Geometry > MA.C.1.3.1.7.2-Determines the measure of various types of angles using a protractor or angle relationships.

GA Assessment Curriculum - 2006 > Grade 8 > Geometry & Measurement > 27-Degree, Protractor-Measures and draws angles using a protractor and classifies angles by their measures.

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