Lesson Planning of PARTS OF CIRCLE Subject Mathematics Grade 4th

 

Lesson Planning of PARTS OF CIRCLE

Subject Mathematics

Grade 4^th

Students` Learning Outcomes

• Identify Center, radius, diameter and circumference of a circle.
• Draw a circle of given radius using compass and straightedge / ruler

Information for Teachers

• Circle: A circle is the set of all points equidistant from a central point.

• Arc: a curved line that is part of the circumference of a circle.
• Chord: a line segment inside a circle which joins two points of the circle with each other. (Which may not pass though center of circle?)
• Circumference: the total distance around the circle.
• Diameter: the line segment which joins the two points of circle by passing through the center of circle.
• Center of circle: the point from where all the points of circle are at equal distance.

• Pi (π): A number, 3.14152… that equal to the circumference / diameter of any circle.
  
• Radius: distance from center of circle to any point on it.
• Tangent of Circle:  a line perpendicular to the radius that touches only one point on the circle.

Material / Resources

Writing board, chalk/marker, duster, Geometry box, pencil, rubber, paper, textbook, circular card pieces

Introduction

• Ask students the names of circular shape from daily life. (Cycle wheel, ring, and bangle)
• Tell them, in a cycle wheel where all wires meet called hub (center point) and the length of wires represents radius of the wheel (circle)
• The strip revolves around the wheel represents circumference of wheel.

• Roll out thread around the circular card and ask students to measure its length through scale.
• The measured length will be the circumference.

Development

Activity 1 Tell the students that today we discuss circle, how to draw circle and how to find its radius. Ask them if any of the students knows how to draw a circle by using compass? Let them think and respond. If no one answered tell them “how to draw a circle by drawing it on the board”. Ask students to give more examples of a circle. Ask them if any one of them can see the sun or moon? (Ask them, what is the shape of both sun and moon?) Give time to think and respond. Pair Work: Split class in to pairs. Allocate time of 15 minutes. By drawing different figures ask them to identify the shape of a circle and how we find radius of a circle. See how many students know to draw circle from a compass. Tell them if they find any difficulty in it. By drawing these shapes ask them what shape is of circle? And did we find radius in it? See if anyone can point out? Call students from each pair to come and identify the shape of a circle center point and radius of a circle. Assign questions for individual work. Hence today we learnt about drawing circle. Appreciate the correct work. Correct them where they are wrong.

Activity 2 Split class in to groups of four members in each. Give each group different sizes of circular cardboard. Allocate time 15 minutes. Ask the students to identify the radius and circumference of this circle. Tell them: put the compass on the center and open up to the end point of circle. Measure the open compass through ruler. Now We get radius

Sum up / Conclusion

• Radius, diameter and circumference only related to circle.
• Circumference is the total length of the circle.
• Tell them that diameter is twice of radius.

Assessment

• What is the relation between radius and diameter?
• Draw the following circles on board and ask:

1. What is AB?
2. What is KM?
3. What is point A?

• Teacher involves students to solve exercise given at the chapter of textbook.

Follow up

• Ask students to draw circles on their worksheets.
• Ask them to identify the objects of circle at their home.
• Ask them to draw circles of different sizes with the help of pebbles and chalks on the board and soil.