To warn ships for underwater rocks, a lighthouse spreads a red coloured light over a sector of angle `80^@` to a distance of 16.5 km. Find the area of the sea over which the ships are warned. (Use `pi` = 3.14)

Find the area of the sector of a circle with ratdius 4 cm and of angle 30^@ . Also, find ihe area of the corresponding major sector (Use pi = 3.14).

A chord of a circle of radius 10 cm subtends a right angle at the centre. Find the area of the corresponding : major sector (Use pi=3.14 )

A chord of a circle of radius 10 cm subtends a right angle at the centre. Find the area of the corresponding :(i) minor segment (ii) major sector. (Use pi = 3.14)

A horse is tied to a peg at one corner of a square shaped grass field of side 15 m by means of a 5 m long rope ( see Fig, 12. 11 ). Find (i) the area of that part of the field in which the horse can graze,(ii) the increase in the grazing area if the rope were 10 m long instead of 5 m.(Use pi=3.14 )

A horse is tied to a peg at one corner of a square shaped grass field of side 15 cm by means of a 5 m long rope. Find the increase in the grazing area if the rope overe 10 m long instead of 5 cm. (Use pi=3.14 )