Presentation on theme: "Area Some shapes cover so less a space on a surface and some need a lot of space. Here with shape, I mean two-dimensional figures."— Presentation transcript:
Some shapes cover so less a space on a surface and some need a lot of space. Here with shape, I mean two-dimensional figures.
When Papa and I walk with wet feet, impressions on the dry floor are big and small. I easily understand that area of Papa’s foot is more than that of mine.
I came to know that area can be calculated by finding the number of equal squares that cover the shape. Figures are equal but number of squares are not equal in this case. How Come?
Here the sizes of the squares in the two figures are different. It means unit of measurement is to be written along with the number of such squares.
Here Number of complete squares is 23 and number of incomplete squares is 20. Therefore area of this circle is App.23+1/2(10)=28 sq. units Let us take a Circle.
Here,area of green portion = app.12sq. units and that of Brown portion is app. 6 sq. units. We can find area of irregular Shapes also in the same way.
Hey! it is a square with side3 units and there are 9 small squares in it. It means its area is 9 sq. units. This is a square with side 5 units and it has 25 squares of the same size. We can say that it’s area is 25 sq. units.
LengthBreadthArea 4 units3 units12 sq. units 5 units2 units10 sq. units LengthBreadthArea of a Rectangle L unitsB unitsL x B sq. units Rectangle
SideArea 3 units9 sq. units 5 units25 sq. units SideArea of a Square L unitsL x L sq. units Square
What about area of any Triangle? This yellow triangle is just the half of this rectangle with equal base and equal height. Oh! area of a Right Triangle =1/2Basex Height
Aha! area of this parallelogram is no problem for me now. Parallelogram is just equal to the Rectangle with equal base and equal height.