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Table of Contents
As we already know, shapes can be classified into different labels by identifying characteristics like the number of sides and the number of angles.
See the fact file below for more information on the classifying shapes or alternatively, you can download our 29-page Geometry: Classifying Shapes CCSS 4.G.2 worksheet pack to utilise within the classroom or home environment.
Key Facts & Information
- At the end of the lesson, the student will learn to correctly classify shapes based on the specific lines and angles found. Furthermore, the student will know that there are different classifications of triangles based on the angles involved.
A NOTE FOR THE TEACHER
- When classifying shapes, take note of the following:
- Remember that an equilateral shape has all equal sides.
- Know that a right triangle has a right angle, an acute has all angles less than 90 degrees, and an obtuse has an angle larger than 90 degrees.
- Note that parallelograms always have two pairs of parallel lines.
- As we already know, shapes can be classified into different labels by identifying characteristics like the number of sides and the number of angles.
- To review:
- A circle does not have any sides and corners.
- A triangle always has three sides.
- Shapes with 4 sides are called quadrilaterals.
- Shapes having five or more sides end with the suffix -gon.
- Identifying the number of lines a shape has is only one way to classify shapes. Another way is to check the types of lines a shape has. We can classify shapes by observing the presence or absence of parallel and perpendicular lines. We can also classify shapes by checking whether there is a right angle.
- To start, shapes can be classified as equilateral shapes, such as equilateral triangles, equilateral quadrilaterals, and equilateral polygons. Being equilateral means that all the sides of a shape have equal lengths to each other. To show equal lengths in lines, a tick is drawn to each line.
- For triangles (or three-sided shapes), we can classify them into three different by observing the presence of 90-degree angles. A triangle’s angles add up to 180 degrees. That means one angle can be a right angle. If there is one right angle in the triangle, it is called a right triangle(a). If there is no right angle and all the angles are below 90 degrees, it is an acute triangle(b). If there is an angle that is greater than 90 degrees present, it is an obtuse triangle(c).
- Furthermore, a triangle can also be classified as a scalene triangle(a), a triangle that has no equal lengths of sides. It can also be classified as an isosceles triangle(b), a triangle that has (at least) two lines of equal length. An equilateral triangle is a type of isosceles triangle.
- For quadrilaterals (or four-sided shapes), we can classify them by the number of pairs of parallel lines they have. If they have two pairs of parallel lines, they are called parallelogram(a). A parallelogram can be subdivided into rectangles(1) and rhombuses(2). A square(3) is both a rhombus and a rectangle. On the other hand, there are also quadrilaterals that only have one pair of parallel lines, which are called trapezoids(b).
- Furthermore, we can classify quadrilaterals by determining the presence of right angles. If a quadrilateral has four right angles, it is a rectangle. A quadrilateral that has two right angles is called a right trapezoid(4).
Geometry: Classifying Shapes CCSS 4.G.2 Worksheets
This is a fantastic bundle that includes everything you need to know about Geometry: Classifying Shapes to across 29 in-depth pages. These are ready-to-use worksheets that align with the Common Core CCSS code 4.G.2 for Geometry: Classifying Shapes.
Table of contents:
- A lesson plan
- Warm-up activity
- Math theory explained
- Assisted learning activities
- Independent learning activities
- Extension activities and games
- Answer keys
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Use With Any Curriculum
These worksheets have been specifically designed for use with any international curriculum. You can use these worksheets as-is, or edit them using Google Slides to make them more specific to your own student ability levels and curriculum standards.