how many plants will be there in a circular bed whose outer edge measure 30 cms , allowing 4 cm 2 for each plant ?
"circumference of circular bed = 30 cm area of circular bed = ( 30 ) 2 ⁄ 4 π space for each plant = 4 cm 2 ∴ required number of plants = ( 30 ) 2 ⁄ 4 π ÷ 4 = 17.89 = 18 ( approx ) answer a"
divide(circle_area(divide(30, multiply(2, const_pi))), 4)