Question

How many plants will be there in a circular bed whose outer edge measures $30cm$ allowing $4$ $cm{}^2$ for each plant?

• A. $18$
• B. $750$
• C. $24$
• D. $120$

Answer 1

Answer: (A)

$18$

Circumference = $30cm$ = c
$area=\frac{c^2}{4\pi }=\frac{30\times 30}{4\times \frac{22}{7}}=71.6c{m}^2$
Number of plants $=\frac{A}{4}=\frac{71.6}{4}$
$=17.9\cong 18$