EXERCISE 17.11. A paper is in the form of a rectangle DARK in which DA

1.	EXERCISE 17.11. A paper is in the form of a rectangle DARK in which DA 30 cm30 cmand KD 21 cm. A semicircular portion with AR as diameter iscut-off. Find the area of the remaining part.21 c
Answer» Area of ractangle = 3021= 630 cm^2 Area of semicircle = 1/2pirrr = 21/2= 1/222/721/221/2=113/221/2= 3321/4= 173.25 cm ^2 Area of remaining portion= 630-173.25 = 456.75 cm ^2

EXERCISE 17.11. A paper is in the form of a rectangle DARK in which DA 30 cm30 cmand KD 21 cm. A semicircular portion with AR as diameter iscut-off. Find the area of the remaining part.21 c

Answer»

Area of ractangle = 30*21= 630 cm^2

Area of semicircle = 1/2*pi*r*rr = 21/2= 1/2*22/7*21/2*21/2=11*3/2*21/2= 33*21/4= 173.25 cm ^2

Area of remaining portion= 630-173.25 = 456.75 cm ^2