Question

how many plants (approximately) will be there in a circular bed whose outer edge measures 30 cm allowing 4cm^2for each plant


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Answer 1

18 plants (approximately) will be there in a circular bed.

Step-by-step explanation:

Consider the provided information.

outer edge measures 30 cm that means circumference of circle is 30 cm  

The circumference of circle = 2πr,

$30=2\pi r$

$15=\pi r$

$r=\frac{15\times 7}{22}$

$r=\frac{105}{22}$

Area of circle = πr²

Substitute the respective values.

$A=\pi \times\frac{105}{22}\times \frac{105}{22}$

$A=\frac{22}{7}\times \frac{105}{22}\times \frac{105}{22}$

$A=\frac{105\times 15}{22}\approx 71.59$

It is given that plant take area of 4 cm²

Thus, the total number of plants is: $\frac{71.59}{4}= 17.89\approx18$

Hence, 18 plants (approximately) will be there in a circular bed.

#Learn more

If the diameter of circle is 30m. find the area of circle.

https://brainly.in/question/2400591

Answer 2

Step-by-step explanation:

circumference = 30 cm

Area = C^2 / 4 pi

= 30 x 30 / 4 x 22/7

= 71.6/4

= 17.9

approximate;y and equal - 18 trees

ANS IS A OPTION

This question is from NSTSE BOOK CLASS- 7 CH-11 Perimeter and Area q-5...