1,040
edits
Changes
From Karnataka Open Educational Resources
→Concept #3. Types of polygons
==Concept #3. Types of polygons==
==Concept #3. Types of polygons==
===Learning objectives===
===Learning objectives===
# There are several ways to classify polygons. One way to classify them is by considering their angle measures and side length measures. If a polygon's angles and sides are equal, then the polygon is called a regular polygon. If the measures of a polygon's angles or side lengths differ, then the polygon is called an irregular polygon.
# There are several polygons.
# Polygons are classified by considering their angle measures and side length measures.
# If a polygon's angles and sides are equal, then the polygon is called a regular polygon.
# If the measures of a polygon's angles or side lengths differ, then the polygon is called an irregular polygon.
# Primary shapes can be combined to form composite polygons. (This knowledge will help while deducing area formulae for complex figures which would be derived by splitting them into primary figures.)
===Notes for teachers===
===Notes for teachers===
===Activity No # Tangram===
===Activity No # Tangram===
(f) a triangle with three pieces;
(f) a triangle with three pieces;
(g) a rectangle with all seven pieces.
(g) a rectangle with all seven pieces.
(h) a kite with two traingles.
# Finally, put the pieces back together to form the original square.
# Finally, put the pieces back together to form the original square.
*Developmental Questions:
*Developmental Questions:
# Name the dimensions of each shape.
# Name the dimensions of each shape.
*Evaluation:
*Evaluation:
# Analyse how much space each shape is occupying.
# Were the students able to identify the types of polygons based on the number of sides.
# What can you refer to the space occupied by each shape.
# What type of two triangles would you need to form a square ?
*Question Corner:
*Question Corner:
# What are the characteristic properties of each shape: square, rectangle, triangle, parallelogram and trapezium ?
# What are the characteristic properties of each shape: square, rectangle, triangle, parallelogram and trapezium ?
# What did you learn from this activity ?
# What did you learn from this activity ?
