# MENSURATION

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Slide 1: Slide
MathematicsSecondary Education

This lesson contains 16 slides, with interactive quizzes and text slides.

Lesson duration is: 40 min

## Items in this lesson

#### Slide 1 -Slide

Area and Perimeter

WARM UP.........

#### Slide 3 -Slide

Area of a rectangle

Area of a circle.

Circumference of a circle
The value of pi
2𝝅𝒓
𝟐𝟐/𝟕 𝒐𝒓 𝟑.𝟏𝟒
l×b
𝝅𝒓^𝟐
2(l+b)

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Cylinder

#### Slide 5 -Mind map

What do you see common in these pictures?

#### Slide 6 -Slide

As a part of  painting competition, Grade 8 students decided to participate in a bottle art competition. Initially, their task is to paint the curved face of each bottle using a white colour. They collected bottles and started to paint. If 10 bottles are to be painted, how much paint is required in total?

#### Slide 7 -Slide

Curved Surface Area of a Cylinder.
Learning Objectives:
1)Derive the formula for CSA of Cylinder
2)Apply the formula to solve real life problems.

#### Slide 8 -Slide

LO: Derive the formula for CSA of Cylinder
Instructions:
1. Roll a rectangular sheet along its length and make in to a cylinder.
2.   Compare the dimensions of rectangle and cylinder .

Activity:

#### Slide 9 -Slide

LO: Derive the formula for CSA of Cylinder

The curved surface area of the cylinder =

r= base radius of the cylinder
h = height of the cylinder

2πrh

#### Slide 10 -Slide

What is the formula for finding the curved surface area of a cylinder?
A
2πr
B
2πrh
C
πr2
D
πrh

#### Slide 11 -Quiz

The base radius of a cylinder is 7 cm and its height is 10cm.Find the curved surface area of the cylinder.

#### Slide 12 -Open question

Curved Surface Area of a Cylinder.
Learning Objectives:
1)Derive the formula for CSA of Cylinder
2)Apply the formula to solve real life problems.

#### Slide 13 -Slide

Activity-Choice Board

#### Slide 14 -Open question

Activity 1-Wrapping Pencils

Take an A4 size paper and your pencil.
Find the Area of A4 sheet and CSA of pencil.
How many such pencils you can wrap with the A4 sheet?

Activty :2-Notebook Page

Create your own notebook page that teaches others how to find the curved surface area of a cylinder. Your notebook page should
include a learning objective, definitions of important vocabulary words, and at least 2
practice problems.

Activity 3:Frame and Solve

Create a real life situation and frame a question based on curved surface area of a cylinder and solve it.

Learning Objectives:
1)Derive the formula for CSA of Cylinder
2)Apply the formula to solve real life problems.

CHOICE BOARD
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