Obtuse Angle Study Guide
An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees. It is wider than a right angle (90 degrees) and narrower than a straight angle (180 degrees).
Basics of Angles
- Acute Angle: Measures less than 90 degrees.
- Right Angle: Measures exactly 90 degrees.
- Obtuse Angle: Measures more than 90 degrees but less than 180 degrees.
- Straight Angle: Measures exactly 180 degrees.
- Reflex Angle: Measures more than 180 degrees but less than 360 degrees.
Identifying Obtuse Angles
- Place the center of the protractor on the vertex of the angle.
- Align one of the arms of the angle with the baseline of the protractor.
- Read the measurement on the protractor where the second arm intersects the scale.
Example
Suppose we have an angle with arms that measure 60 degrees and 120 degrees. By using a protractor, we can measure the angle to be 120 degrees, which indicates that it is an obtuse angle.
Study Guide
- Measurement Range: An obtuse angle measures more than 90 degrees but less than 180 degrees.
- Identification: Use a protractor to measure the angle and determine if it falls within the range of obtuse angles.
- Real-Life Examples: Look for real-life examples of obtuse angles in various objects or structures.
Remember to practice measuring and identifying obtuse angles using a protractor to reinforce your understanding.
.◂Math Worksheets and Study Guides Fifth Grade. Plot Points
Study Guide
Plot Points 
Worksheet/Answer key
Plot Points Worksheet/Answer key
Plot Points Worksheet/Answer key
Plot Points Worksheet/Answer key
Coordinate Map Worksheet/Answer key
Coordinate Treasure Map Vocabulary/Answer key
Plot Points
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
Geometry (NCTM)
Analyze characteristics and properties of two- and three-dimensional geometric shapes and develop mathematical arguments about geometric relationships.
Identify, compare, and analyze attributes of two- and three-dimensional shapes and develop vocabulary to describe the attributes.
Specify locations and describe spatial relationships using coordinate geometry and other representational systems.
Describe location and movement using common language and geometric vocabulary.
Make and use coordinate systems to specify locations and to describe paths.
Connections to the Grade 5 Focal Points (NCTM)
Data Analysis: Students apply their understanding of whole numbers, fractions, and decimals as they construct and analyze double-bar and line graphs and use ordered pairs on coordinate grids.