Question

(a) Work out the perimeier of the field correct to 1 decimal place.
(circumference of circle = 1 X diameter)​

Answer 1

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GIVEN :-

A Rectangular Park is Surrounded by 4 Semicircular Flower Beds.

So,

The Diameter of 2 Semicircles = 100m

The area of semicircles = Area of 2 big Semicircles + Area of 2 Small Semicircles.

= 2πr² + 2πR²

= 2(22/7×50×50)+2(22/7×25×25)

= 2×22/7(50×50+25×25)

= 44/7( 2500 + 625 )

= 44/7( 3125 )

= 44 × 3125/7 = 19642.8 ( Approx )

Cost = 19642.8 × 60/100

= ₹11785.