Lesson Planning of PARTS OF CIRCLE
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
- 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.
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.
- What is the relation between radius and diameter?
- Draw the following circles on board and ask:
- What is AB?
- What is KM?
- What is point A?
- Teacher involves students to solve exercise given at the chapter of textbook.
- 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.