(ICSE)13. A lawn is in the shape of a semi-circle of diameter35 dm. Th

1.	(ICSE)13. A lawn is in the shape of a semi-circle of diameter35 dm. The lawn is surrounded by a flower bed ofwidth 3.5 dm all round. Find the area of the flower(ICSE)bed in dm?.14. A road which is 7 m wide surrounds a circular parkwhose circumference is 352 m. Find the surface area(ICSE)of the road
Answer» radius of lawn = 35/2 dm radius of lawn including flower bed = 35/2 + 3.5 = 21 dm area of flower bed = area of lawn including flower bed - area of lawn = 1/2 * 22/7 * 21 * 21 - 1/2* 22/7* 35/2* 35/2 = 1/2* 22/7 ( 441 - 1225/4 ) =11/7 * 539/4 = 11 * 77/4 = 211.75 dm

(ICSE)13. A lawn is in the shape of a semi-circle of diameter35 dm. The lawn is surrounded by a flower bed ofwidth 3.5 dm all round. Find the area of the flower(ICSE)bed in dm?.14. A road which is 7 m wide surrounds a circular parkwhose circumference is 352 m. Find the surface area(ICSE)of the road

Answer»

radius of lawn = 35/2 dm

radius of lawn including flower bed = 35/2 + 3.5 = 21 dm

area of flower bed = area of lawn including flower bed - area of lawn

= 1/2 * 22/7 * 21 * 21 - 1/2* 22/7* 35/2* 35/2

= 1/2* 22/7 ( 441 - 1225/4 )

=11/7 * 539/4

= 11 * 77/4

= 211.75 dm