Lesson Plan of Geometry (Two, Three – Dimensional Figures)
Students` Learning Outcomes
- Identify the figures like square, rectangle, triangle, circle, semi-circle and quarter circle.
- Identify vertices and sides of a triangle, rectangle and square.
Information for Teachers
- Students already have a good idea of different basic shapes.
- Circle and oval shapes have no corners.
- Square and rectangle have four corners and four sides.
- Triangle has three corners and three sides.
- A vertex is the corner or intersection of any shape. The plural is vertices.
- The competency here is to develop mathematical vocabulary e.g. corners, vertices, sides, semicircle, circle, quarter circle,
- While teaching the lesson, the teacher should also consult textbook at all steps wherein and whenever it is applicable.
Material / Resources
Writing board, chalk/marker, duster, glass, card sheet, scissors, 2 D shapes (triangle, rectangle, and square)
- Ask the following questions from students to generate whole class discussion.
- What is the shape of the black board of your classroom?
- Identify the corners in this board.
- How many sides does this board have?
- Show them one note book, ask about its shape, corner and the number of sides it has.
- Repeat the same with different objects of different shapes.
- Demonstrate to the students how they can get a circle, semicircle, and quarter circle by using a card sheet.
- Take a piece of paper and draw a circle with the help of a glass.
- Cut this circle with the help of scissors.
- Show and tell them that this is called circle.
- Ask one of the students to fold this circle into two halves. Now open the circle and cut it into two equal parts along the folding line.
- You may refer back to the concept of fractions at this point.
- You may also remind them that each circle is ½ or half of the original circle.
- Show and tell them that each part is called a semi-circle.
- Ask two of the students to take a semi-circle and fold it into two halves. Cut this semi-circle into two equal parts along the folding line.
- Show and tell them that each part is known as a quarter circle.
- You may remind them of fractions at this point.
- Remind them that in fraction terms a quarter is written as ¼
- Sum up the demo by explaining that a circle equally divided in 2 parts is 2 semi-circles and each of those 2 semi-circles further divided in to two is 4 quarters of the circle.
- Divide the class in groups four.
- Provide each group with different shapes, as;
- Tell each group to highlight / color corners in each shape.
- Give them some time for discussion within groups.
- Call any two groups to present their work for whole class by pointing out corners in each shape.
- Encourage other students to ask different questions from presenters to clear the concept further.
- Sum up the activity by explaining that a corner of any shape is called vertex, explain about the sides of shapes as well. Be sure about the use of mathematical vocabulary.
- Show a big box of square shape to the students (Carton)
- Ask them to tell how many sides and vertices it has?
- Encourage them to put a mark or a line on the vertex they have already counted so they don`t count it a second time.
- Facilitate / explain if they find difficulty in understanding and identification.
- Repeat the same procedures by showing them different 2D and 3D objects e.g. egg/ oval stone, plastic block etc.
- Divide the class in groups of four.
- Provide them different objects (2D, 3D)
- Tell them to identify and explain about the sides and vertices of those objects to each other within group.
- Sum up the activity by asking following questions:
- How many sides and vertices do a square and rectangular have?
- How many sides and vertices do a triangular have?
- How many sides and vertices does an oval circle have?
- Provide them a work sheet with different shapes drawn on it, or draw these on the board for the students to copy.
- Ask the students to write how many sides and vertices does each shape have e.g.
Sum up / Conclusion
- Ask the following questions from students, as;
- What was the lesson about?
- What is the appropriate word for corner? (Mathematical vocabulary)
- Can any one of you explain how many sides and vertices your teacher`s table has?
- How many sides and vertices does your classroom have?
- Tell the students to draw different shapes e.g. square, rectangle, triangle, and circle, semi-circle and quarter circle in their notebooks / copies.
- Ask them to color their vertices and write how many sides each shape has?
- Teacher is also required to involve the students in solving the problems given in the exercise at the end of unit/chapter.