Angles
An angle is formed by two rays that share a common endpoint, called the vertex. Angles are measured in degrees, and the size of an angle is determined by the amount of rotation from one ray to the other.
There are different types of angles:
- Acute Angle: An angle that measures between 0 and 90 degrees.
- Right Angle: An angle that measures 90 degrees. It forms the shape of an "L".
- Obtuse Angle: An angle that measures between 90 and 180 degrees.
- Straight Angle: An angle that measures 180 degrees. It forms a straight line.
- Reflex Angle: An angle that measures between 180 and 360 degrees.
Angles can be identified using a protractor, and they are used in various geometric and trigonometric calculations.
.◂Math Worksheets and Study Guides Third Grade. Congruent Shapes
Study Guide
Congruent Shapes 
Activity Lesson
Congruent Shapes Worksheet/Answer key
Congruent Shapes Worksheet/Answer key
Congruent Shapes Worksheet/Answer key
Congruent Shapes Worksheet/Answer key
Congruent Shapes Vocabulary/Answer key
Congruent Shapes
Activity LessonWorksheet/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.
Classify two- and three-dimensional shapes according to their properties and develop definitions of classes of shapes such as triangles and pyramids.
Explore congruence and similarity.
Use visualization, spatial reasoning, and geometric modeling to solve problems.
Recognize geometric ideas and relationships and apply them to other disciplines and to problems that arise in the classroom or in everyday life.
Grade 3 Curriculum Focal Points (NCTM)
Geometry: Describing and analyzing properties of two-dimensional shapes
Students describe, analyze, compare, and classify two-dimensional shapes by their sides and angles and connect these attributes to definitions of shapes. Students investigate, describe, and reason about decomposing, combining, and transforming polygons to make other polygons. Through building, drawing, and analyzing two-dimensional shapes, students understand attributes and properties of two-dimensional space and the use of those attributes and properties in solving problems, including applications involving congruence and symmetry.