Exploring area and perimeter
From Karnataka Open Educational Resources
Revision as of 18:29, 27 December 2022 by Anusha sharma (talk | contribs)
Activity 1: Area and Perimeter concepts
Materials:
Rectangular dot sheets, stationery
Objective:
To understand the relationship between area and perimeter of 2D shapes
Process:
- Recall area and perimeter concepts: ask students to explain the meaning of area and perimeter in their own words
- Establish differences between area and perimeter:
- Perimeter is a one dimensional quantity and area is a two dimensional quantity
- Area is expressed in sq.units and perimeter in units
- Area defines the space occupied by a shape, perimeter is the length of its boundary
- Hand over dot sheets to individual students or pairs of students and inform that the distance between any two horizontally or vertically adjacent dots in the dot sheet is 1 cm
- Ask students to draw and shade a square of area 1 sq. cm and ask them to find out the perimeter of the same
- Repeat for 4 sq.cm
- Ask students to observe these shapes and find out what is the area and perimeter of each shape.
- Next, draw this shape on the board/project this image and ask students what is the area and perimeter of this shape. If anyone is unclear, explain how the area and the perimeter can be found out
- Ask students to calculate the area of the shaded region (8 sq. cm). Then, ask them to draw a different shape with the same area
- Next, ask them to compare the perimeter of the shape displayed and the one they drew
- Call out a few students whose shapes have perimeter lesser, greater and same as the one displayed and share it with the class
- If there are no examples for any of the categories, challenge them to find suitable shapes