1. The document provides a lesson template for teaching 8th standard students about calculating the surface area of a rectangular prism. 2. It explains that the surface area is the sum of the areas of each rectangular face, and provides the formula: Surface Area = 2(lb + bh + lh). 3. As an example, it calculates the surface area of a prism with dimensions of length 8cm, breadth 5cm, and height 10cm to be 340cm^2.

1. ***Innovative Lesson
Template***
ARUNA.J.S
MATHEMATICS
18014376005

2. Name of the teacher : ARUNA.J.S Standard : VIII
Name of the school : NHSS, Nellimoodu. Division :
Subject : Mathematics Strength :
Unit : Prism Date :
Sub Unit : Surface area of a
Rectangular prism Duration : 45
Curricular Statement: To understand the surface area of a rectangular prism
CONTENT ANALYSIS
Terms : Surface area, rectangle
Facts : 1. Base are rectangle
2. Lateral faces are rectangle in shape
Concept : Conceptof rectangular prism
Principle : Surface area of rectangular prism is the sum of the areas of each
rectangle.
Process : Process offinding surface area of a rectangular prism
Formula : Surface Area of rectangular prism = 2*(bh+lh+lb)
Symbol : l  length
b  breadth
h  height

3. Learning outcomes : The pupil
1. Remembering the information about the surface
area of rectangular prism
2. Develop understanding in finding the surface area
of rectangular prism
3. Applying above information in familiar situations
4. Analysing the information to explore understanding
relationships.
5. Justifying the above conceptand formula
6. Creating new ideas related to above facts and
concepts
7. Develop skill in finding surface area of a
rectangular prism
8. Develop interest in finding surface area of a
rectangular prism
Pre-requisites : rectangle, surface area
Teaching learning aids : Slides describing the concept.

4. Class roomInteraction Procedure Pupil Response
Preparation:
Teacher asked about of prisms and asked about
different types of prisms
What are the peculiarities of rectangular prism?
Then teacher show a slide containing the concept
about rectangular prism
Rectangular Prism
 Bases are rectangular
 Lateral faces are rectangle in shape

5. Class room Interaction Procedure Pupil Response
Teacher asked how will are find the surface area of a
rectangular prism.
HOW CAN WE FIND THE SURFACE AREA
OF A RECTANGULAR PRISM
Development:
Teacher asked to draw and mark l, b, h of the
unfolded figure of rectangular prism.
First we draw the unfolded figure of
rectangular prism
h
b
l

6. Class room interaction procedure Pupil response
Then teacher ask to find the area of each rectangle.
Then teacher ask what is the areas of a rectangle
Formula for finding the area of a rectangle
Area = l + b
After the slide presentation teacher find the areas of
each rectangle.
From this the teacher concludes that total surface area
of a rectangular prism is sum of areas of all
rectangles.
i.e,
Then teacher show a slide
Surface area of rectangular prism
= sum of areas of each rectangle

7. i.e, Total surface area of a rectangular prism
= lb+lh+bh+1b+1h+bh
= 2 lb+2lh+2bh
= 2(1b+1h+bh)
i.e, Surface area = 2(lb + bh + 1h)
After that teacher show a slide
Surface area of rectangular prism
= 2 (l*b+b*h+l*h)
Application:
In a rectangular prism, h=10 cm, l=8cm, b = 5cm
Then what is the total surface area?
Teacher asks what are given.
What is to be finding out?
What is the formula for finding surface area?
Teacher ask to find answer and do it in the B.B
h = 10 cm
l = 8 cm
b = 5 cm
Surface area of a
rectangular prism =
2(lb+bh+lh)

8. Surface area = 2(lb+bh+1h)
= 2x(8*5+5*10+8*10)
= 2(40+50+80)
= 2 x 170
= 340 cm2
Review:
1. What is the formula for finding surface area of a rectangular prism ?
Follow- up Activity:
1. Find the surface area of a rectangular prism having length 12cm, height
15 cm and breadth 10 cm