Question

Vikram wants to spray insecticide on a circular lawn of width 3.5 m built outside his circular plot of land with radius 14m. if an insecticide packet can cover an area of 19.25 square metre, how many packets of insecticide does he need

Answer 1

Answer:

Step-by-step explanation:

This is a circle within a circle.

The lawn surrounds the plot.

The radius of the plot is :

Radius = 14 + 3.5 = 17.5M

The area of the plot :

22/7 × 14 × 14 = 616 meters squared.

The area of the outer circle is :

22/7 × 17.5 × 17.5 = 962.5 meters squared.

The area of the lawn :

962.5 - 616 = 346.5 meters square

1 packet = 19.25 meters square

346.5/19.25 = 18

18 packets of insecticide is needed.

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