In the part of ‘Nadu-Nedu’ programme, Head master decided to arran

1.	In the part of ‘Nadu-Nedu’ programme, Head master decided to arrange circular shape flower bed with radius 7 m in the premises of his school. How many flower plants needed if it takes 4 plants per sq. m. ?
Answer» Here, length of the rectangle (l) = Half of the perimeter of circle = πr breadth of the rectangle (b) = radius of circle = r We know that the area of the rectangle = l × b = πr × r (∵ l = πr, b = r) = πr² – Area of the circle. So, the area of the circle A = πr² Now we solve above problem, where ‘r’ = 7m Area of flower bed = πr² = \(\frac {22}7\) × 7 × 7 = 22 × 7 = 154 sq.m Number of plants per sq.m = 4 Number of plants for 154 sq.m = 154 × 4 = 616 plants. So, Headmaster needs 616 plants for the flower bed.

In the part of ‘Nadu-Nedu’ programme, Head master decided to arrange circular shape flower bed with radius 7 m in the premises of his school. How many flower plants needed if it takes 4 plants per sq. m. ?

Answer»

Here, length of the rectangle (l)

= Half of the perimeter of circle

= πr

breadth of the rectangle (b)

= radius of circle = r

We know that the area of the rectangle

= l × b = πr × r (∵ l = πr, b = r)

= πr² – Area of the circle.

So, the area of the circle A = πr²

Now we solve above problem,

where ‘r’ = 7m

Area of flower bed = πr²

= \(\frac {22}7\) × 7 × 7

= 22 × 7

= 154 sq.m

Number of plants per sq.m = 4

Number of plants for 154 sq.m

= 154 × 4 = 616 plants.

So, Headmaster needs 616 plants for the flower bed.