Classification of Figures ( Number of Sides)

Lesson Plan of Classification of Figures according to Number of Sides

Subject Mathematics

Grade III

Students` Learning Outcomes

  • Classify figures according to the number of sides as quadrilaterals (rectangles, squares) and triangles.

Information for Teachers

  • A triangle has three sides and three vertices.
  • Classification of Figures according to Number of Sides
  • A quadrilateral has four sides and four vertices.

Classification of Figures according to Number of Sides

  • While teaching the lesson, also consult textbook where and when applicable.

Material / Resources

Writing board, chalk/ marker, duster, cutouts of triangles, square and rectangle, meter ruler, textbook

Introduction

  • Show cutouts of triangle to the students and ask them to count its sides and vertices.

Classification of Figures according to Number of Sides

  • After taking their responses, show another types of triangles and ask to count its sides and vertices.
  • Is there any difference in the number of sides and vertices of both triangles?
  • Conclude to them that a three-sided shape is called triangle.
  • A triangle has three sides and three vertices.
  • Now show cutout of rectangle to the students and ask them to count, how many sides and vertices it has?

Classification of Figures according to Number of Sides

  • After taking their response, tell them that it has four sides and four vertices.
  • Show them cutout of square and they will count the number of sides and vertices.

Classification of Figures according to Number of Sides

  • Ask the students, is there any difference in the number of sides and vertices of rectangle and square.

Development

Activity 1

  • Draw three points on the board and ask the students to copy on their notebooks and join these points to make a shape.

Classification of Figures according to Number of Sides

  • Ask the students about the name of shape (triangle) and the number of line segments.(3)
  • Demonstrate to the students that a triangle has three sides AC, BC and AB and three vertices A,B and C.

Classification of Figures according to Number of Sides

Activity 2

  • Demonstrate the drawing of quadrilaterals to the students on the board.
  • Mark four points on the board and join them to make a quadrilateral. Tell the students that the sides of quadrilateral can be of any length.
  • Ask from students to draw quadrilaterals on their own.

Classification of Figures according to Number of Sides

  • Check the result and ask them to identify squares and rectangles from these quadrilaterals.
  • Ask from students, that rectangle and square are the examples of quadrilateral. Why?

Activity 3

  • Demonstrate the concept of type of quadrilaterals as rectangle and square to the students.
  • Draw square and rectangle on the board.

Classification of Figures according to Number of Sides

  • Ask from students, what is the difference between rectangle and square.
  • After taking their response, explain to them that rectangle has equal opposite sides, whereas a square has four equal sides.
  • Draw the following chart on the board; now call the students one by one to measure the lengths of the sides of the rectangle and square. Put their results in the table.

Classification of Figures according to Number of Sides

Sum up / Conclusion

  • A triangle has three sides and three vertices.
  • A quadrilateral has four sides and four vertices.

Classification of Figures according to Number of Sides

  • Rectangle and square are example of quadrilaterals.

Assessment

  • What is the difference between these three figures?

Classification of Figures according to Number of Sides

Follow up

  • Draw following figures on board and student draw these on their copies.
  • Ask them to put tick on the quadrilaterals and x on the others.

Classification of Figures according to Number of Sides

  • Ask the students to solve the questions given in the textbook.

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