Question

A cicle of radius 3cm is cut out from the square cardboard sheet of the side 7cm what is the area of remaining sheet

Answer 1

area of square = s.s

given the side is 7cm

area=49

area of circle =

$\pi \: r ^{2}$

22/7×3×3

22/7×9

28.26

49-28.26

20.74

Answer 2

Answer:

• The area of a remaining sheet = 20.74 cm²

Given :

• Radius of the circle = 3 cm

• The side of the square cardboard = 7 cm

To find :

• The area of remaining sheet =?

Step-by-step explanation:

Area of square = side²

Substituting the values in the above formula, we get,

= (7)²

= 7 x 7

= 49

So, area of the square is 49 cm²

Now,

Area of circle = πr²

Substituting the values in the above formula, we get,

= 22/7×3×3

= 22/7×9

= 28.26

So, the area of a circle is 28.26 cm²

Thus, The area of remaining sheet = Area of square - Area of circle.

= 49 - 28.26

= 20.74

So, the area of remaining sheet = 20.74 cm²

❋Another Shortcut method ❋

Area of remaining sheet = Area of square - Area of circle.

= side² - πr²

Substituting the values in the above formula, we get,

= (7)² - 22/7×3×3

= 49 - 22/7×9

= 49 - 28.26

= 20.74

Hence, the area of a remaining sheet = 20.74 cm²