A RACE TRACK IS IN THE FORM OF A RING WHOSE INNER CIRCUMFERENCE IS 264 METRES AND THE OUTER CIRCUMFERENCE IS 308 METRES . FIND THE COST OF PLANTING GRASS ON THE RACE TRACK IF THE COST OF PLATING GRASS IS RS 30 PER SQUARE METER .
PLS DON'T SOAM , IT'S MY HUMBLE REQUEST .
Answers
Answer:
Let the radius of the outer circle be R m.
circumference of the outer circle = 2×22/7×R
=)2×22/7×R = 308
=)44/7R = 308
=)R = 308×7/44 = 7×7
=)R = 49
So,the radius of the outer circle is 49m.
Let the radius of the inner circle be r m
circumference of the inner circle = 2×22/7×r
=)2×22/7×r = 264
=)44/7r = 264
=)r = 264×7/44 = 6×7
=)r = 42
So,the radius of the inner circle is 42m.
Area of the full circle = (22/7×49×49)square metre
=7546 square metre
Area of the without circle = (22/7×42×42)square meter
= 5544 square metre
Area of the track = (7546-5544) sq m
= 2002 sq m
Therefore, area of the track is 2002 sq m.
Rate of planting grass = Rs. 30/ sq m
Cost of planting grass on the race track
= Rs.(2002×30) = Rs. 60060
Therefore, cost of planting grass on the racetrack is Rs.60060
Answer:
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