3. The area of a circle is 13.86 hectares. The cost of fencing it at ?

1.	3. The area of a circle is 13.86 hectares. The cost of fencing it at ? 4 per metre is(a) 7920(b) 5240(c) R 5280(d) 7960
Answer» 1 hectare=10000m²13.86 hectares=13.8610000=138600m²Area of circle=πr²138600=(22/7)r²r²=44100r=210 m Circumference =2πr=2(22/7)(210)=1320 m 1 m cost=4 Rs1320 cost=41320=5280 Rs option c is correct

3. The area of a circle is 13.86 hectares. The cost of fencing it at ? 4 per metre is(a) 7920(b) 5240(c) R 5280(d) 7960

Answer»

1 hectare=10000m²13.86 hectares=13.86*10000=138600m²Area of circle=πr²138600=(22/7)r²r²=44100r=210 m

Circumference =2πr=2(22/7)(210)=1320 m

1 m cost=4 Rs1320 cost=4*1320=5280 Rs

option c is correct