perimeter of different shapes

*Engage*

We take some different shapes How to measure their boundary

Measuring the boundary of any shape is called perimeter perimeter Let’s measure the perimeter of these figures (a) (c) (b)

*Explain*

Perimeter

circle radius diameter

circle radius diameter circumference of the circle=2πr (r is the radius of the circle) =2x22/7x7 =44cm square

circle radius diameter circumference of the circle=2πr (r is the radius of the circle) =2x22/7x7 =44cm square

Equilateral triangle Perimeter=sum of all three sides =(5+5+5)cm =15cm Perimeter=5cm+4cm+3cm =12cm Right angle triangle 5cm 4cm 3cm

8cm 5cm 4cm Perimeter= 8cm+5cm+4cm =17cm Scalene triangle

*Elaborate* Your turn…….

rectangle trianglesquare measure 30cm 15cm 14cm 15cm perimeter of the triangle=34cm ???

*Engage*

Firstly we have different shapes Recognize ?????

*Explain*

Area that is cover by a shape: -

Space covered by any object or shape is called the area of the shape

Area of a rectangle area 5cm 3cm 15 square of 1cm Area of rectangle= length x breath Area = 15cmsquare 1 square unit

*Elaborate* Your turn…….

Measure the area of different shapes 30cm 15cm 8cm R=2cm 8cm R=2cm R=1cm r R