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==Notes for teachers==
==Notes for teachers==
===Activity No #===
===Activity No # 1. Which polygon am I ? ===
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|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">
''[http://www.karnatakaeducation.org.in/?q=node/305 Click to Comment]''</div>
''[http://www.karnatakaeducation.org.in/?q=node/305 Click to Comment]''</div>
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*Estimated Time
*Estimated Time: 30 minutes.
*Materials/ Resources needed
*Materials/ Resources needed: Laptop, geogebra file, projector and a pointer.
*Prerequisites/Instructions, if any
*Prerequisites/Instructions, if any:
*Multimedia resources
# The students should know that lines intersect to form figures.
# Plane closed figures with ≥ 3 sides are known as polygons .
# The intersecting points of two lines is known as a vertex and the lines are the edges/sides.
# The student should know the meaning of greek numerals uni, bi, tri ....etc.
*Multimedia resources: Laptop
*Website interactives/ links/ / Geogebra Applets
*Website interactives/ links/ / Geogebra Applets
*Process/ Developmental Questions
*Process:
*Evaluation
# The teacher can tell the students that they are surrounded by many different kinds of shapes every day.
*Question Corner
# Many of these shapes are two-dimensional plane figures.
# Plane figures are flat. They can be closed or not closed.
# Plane figures made up of three or more closed line segments are polygons.
# Each line segment of a polygon is a side. Polygons are classified and named based on the number of sides.
*Developmental Questions:
# How many vertices, sides and angles does this figure have ? Name the figure.
# What is the point of intersection of two lines called ?
# What parameters do you identify in each figure ? (side, vertex, angle, plane surface and area )
# What can you say about the number of vertices and the number of sides in each figure ?
# Which figure would you think will be formed if the number of sides is increased indefinately.
*Evaluation:
# What determines the side or edge of the figure ?
# Are the students able to corelate the names with the number of sides ?
# Are the students able to appreciate the nature of shapes formed with each increasing side?
# Students can discuss angle sum property in each case by dividing the figure into triangles or quadrilaterals.
*Question Corner:
# A hexagon is a polygon with _________ angles.
# Is circle a polygon ?
# What is a polygon with 12 sides called ?
# You have a collection of sides from triangles and decagons. The total number of sides is 100 and you have 4 decagons. How many triangles do you have ?
===Activity No # ===
===Activity No # ===
